{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2021-25217", "assignerOrgId": "404fd4d2-a609-4245-b543-2c944a302a22", "assignerShortName": "isc", "dateUpdated": "2024-09-16T22:08:32.175Z", "dateReserved": "2021-01-15T00:00:00", "datePublished": "2021-05-26T22:10:11.312869Z"}, "containers": {"cna": {"title": "A buffer overrun in lease file parsing code can be used to exploit a common vulnerability shared by dhcpd and dhclient", "datePublic": "2021-05-26T00:00:00", "providerMetadata": {"orgId": "404fd4d2-a609-4245-b543-2c944a302a22", "shortName": "isc", "dateUpdated": "2023-05-03T00:00:00"}, "descriptions": [{"lang": "en", "value": "In ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16, ISC DHCP 4.4.0 -> 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in lack of service to clients. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. if the dhcpd server binary was built for a 64-bit architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not occur, but it is possible for the offending lease and the lease which immediately followed it to be improperly deleted."}], "affected": [{"vendor": "ISC", "product": "ISC DHCP", "versions": [{"version": "4.1 ESV", "status": "affected", "lessThan": "4.1-ESV-R16-P1", "versionType": "custom"}, {"version": "4.4", "status": "affected", "lessThan": "4.4.2-P1", "versionType": "custom"}]}], "references": [{"url": "https://kb.isc.org/docs/cve-2021-25217"}, {"name": "[oss-security] 20210526 ISC has disclosed a vulnerability in ISC DHCP (CVE-2021-25217)", "tags": ["mailing-list"], "url": "http://www.openwall.com/lists/oss-security/2021/05/26/6"}, {"name": "FEDORA-2021-08cdb4dc34", "tags": ["vendor-advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z2LB42JWIV4M4WDNXX5VGIP26FEYWKIF/"}, {"name": "[debian-lts-announce] 20210603 [SECURITY] [DLA 2674-1] isc-dhcp security update", "tags": ["mailing-list"], "url": "https://lists.debian.org/debian-lts-announce/2021/06/msg00002.html"}, {"name": "FEDORA-2021-8ca8263bde", "tags": ["vendor-advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5QI4DYC7J4BGHEW3NH4XHMWTHYC36UK4/"}, {"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-406691.pdf"}, {"url": "https://security.netapp.com/advisory/ntap-20220325-0011/"}, {"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf"}, {"name": "GLSA-202305-22", "tags": ["vendor-advisory"], "url": "https://security.gentoo.org/glsa/202305-22"}], "credits": [{"lang": "en", "value": "ISC would like to thank Jon Franklin from Dell and Pawel Wieczorkiewicz from Amazon Web Services for (independently) reporting this vulnerability."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "baseScore": 7.4, "baseSeverity": "HIGH"}}], "problemTypes": [{"descriptions": [{"type": "text", "lang": "en", "description": "Program code used by the ISC DHCP package to read and parse stored leases has a defect that can be exploited by an attacker to cause one of several undesirable outcomes, depending on the component attacked and the way in which it was compiled. Because of a discrepancy between the code which handles encapsulated option information in leases transmitted \"on the wire\" and the code which reads and parses lease information after it has been written to disk storage, it is potentially possible for an attacker to deliberately cause a situation where: dhcpd, while running in DHCPv4 or DHCPv6 mode, or dhclient, the ISC DHCP client implementation will attempt to read a stored lease that contains option information which will trigger a bug in the option parsing code. Affects ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16, ISC DHCP 4.4.0 -> 4.4.2. Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability. Affects both dhcpd (server) and dhcpcd (client)."}]}], "x_generator": {"engine": "Vulnogram 0.0.9"}, "source": {"discovery": "USER"}, "workarounds": [{"lang": "en", "value": "None known."}], "exploits": [{"lang": "en", "value": "We are not aware of any active exploits."}], "solutions": [{"lang": "en", "value": "Upgrade to the patched release most closely related to your current version of ISC DHCP:\n\n ISC DHCP 4.1-ESV-R16-P1\n ISC DHCP 4.4.2-P1"}]}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T19:56:11.067Z"}, "title": "CVE Program Container", "references": [{"url": "https://kb.isc.org/docs/cve-2021-25217", "tags": ["x_transferred"]}, {"name": "[oss-security] 20210526 ISC has disclosed a vulnerability in ISC DHCP (CVE-2021-25217)", "tags": ["mailing-list", "x_transferred"], "url": "http://www.openwall.com/lists/oss-security/2021/05/26/6"}, {"name": "FEDORA-2021-08cdb4dc34", "tags": ["vendor-advisory", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z2LB42JWIV4M4WDNXX5VGIP26FEYWKIF/"}, {"name": "[debian-lts-announce] 20210603 [SECURITY] [DLA 2674-1] isc-dhcp security update", "tags": ["mailing-list", "x_transferred"], "url": "https://lists.debian.org/debian-lts-announce/2021/06/msg00002.html"}, {"name": "FEDORA-2021-8ca8263bde", "tags": ["vendor-advisory", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5QI4DYC7J4BGHEW3NH4XHMWTHYC36UK4/"}, {"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-406691.pdf", "tags": ["x_transferred"]}, {"url": "https://security.netapp.com/advisory/ntap-20220325-0011/", "tags": ["x_transferred"]}, {"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf", "tags": ["x_transferred"]}, {"name": "GLSA-202305-22", "tags": ["vendor-advisory", "x_transferred"], "url": "https://security.gentoo.org/glsa/202305-22"}]}]}}

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4.1-ESV-R16, ISC DHCP 4.4.0 -> 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in lack of service to clients. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. if the dhcpd server binary was built for a 64-bit architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not occur, but it is possible for the offending lease and the lease which immediately followed it to be improperly deleted."}, {"lang": "es", "value": "En ISC DHCP versiones 4.1-ESV-R1 anteriores a 4.1-ESV-R16, ISC DHCP versiones 4.4.0 anteriores a 4.4.2 (Otras ramas de ISC DHCP (es decir, versiones de la serie 4.0.x o inferiores y versiones de la serie 4.3.x) est\u00e1n m\u00e1s all\u00e1 de su End-of-Life (EOL) y ya no son soportadas por ISC. El resultado de encontrar el fallo mientras se lee un contrato de arrendamiento que lo desencadena var\u00eda, seg\u00fan: el componente afectado (es decir, dhclient o dhcpd) si el paquete se construy\u00f3 como un binario de 32 o 64 bits si fue usado el flag del compilador -fstack-protection-strong al compilar En dhclient, ISC no ha reproducido con \u00e9xito el error en un sistema de 64 bits. Sin embargo, en un sistema de 32 bits es posible causar a dhclient bloquearse cuando leen un contrato de arrendamiento inapropiado, lo que podr\u00eda causar problemas de conectividad de red para un sistema afectado debido a la ausencia de un proceso de cliente DHCP en ejecuci\u00f3n. En dhcpd, cuando se ejecuta en modo DHCPv4 o DHCPv6: si el binario del servidor dhcpd fue construido para una arquitectura de 32 bits Y se especific\u00f3 el flag -fstack-protection-strong al compilador, dhcpd puede salir mientras analiza un archivo de arrendamiento que contiene un arrendamiento objetable, resultando en la falta de servicio a los clientes. Si el binario del servidor dhcpd fue construido para una arquitectura de 64 bits O si la flag -fstack-protection-strong del compilador NO fue especificado, el bloqueo no ocurrir\u00e1, pero es posible que el contrato de arrendamiento ofensivo y el que le sigue sean borrados inapropiadamente"}], "id": "CVE-2021-25217", "lastModified": "2023-11-07T03:31:24.893", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "LOW", "cvssData": {"accessComplexity": "LOW", "accessVector": "ADJACENT_NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 3.3, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:A/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 6.5, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 4.0, "source": "security-officer@isc.org", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 4.0, "source": "nvd@nist.gov", "type": "Secondary"}]}, "published": "2021-05-26T22:15:07.947", "references": [{"source": "security-officer@isc.org", "tags": ["Mailing List", "Patch", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2021/05/26/6"}, {"source": "security-officer@isc.org", "tags": ["Patch", "Third Party Advisory"], "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-406691.pdf"}, {"source": "security-officer@isc.org", "tags": ["Patch", "Third Party Advisory"], "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf"}, {"source": "security-officer@isc.org", "tags": ["Exploit", "Vendor Advisory"], "url": "https://kb.isc.org/docs/cve-2021-25217"}, {"source": "security-officer@isc.org", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2021/06/msg00002.html"}, {"source": "security-officer@isc.org", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5QI4DYC7J4BGHEW3NH4XHMWTHYC36UK4/"}, {"source": "security-officer@isc.org", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z2LB42JWIV4M4WDNXX5VGIP26FEYWKIF/"}, {"source": "security-officer@isc.org", "url": "https://security.gentoo.org/glsa/202305-22"}, {"source": "security-officer@isc.org", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20220325-0011/"}], "sourceIdentifier": "security-officer@isc.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-119"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2021:2419", "cpe": "cpe:/o:redhat:rhel_els:6", "package": "dhcp-12:4.1.1-64.P1.el6_10", "product_name": "Red Hat Enterprise Linux 6 Extended Lifecycle Support", "release_date": "2021-06-15T00:00:00Z"}, {"advisory": "RHSA-2021:2357", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "dhcp-12:4.2.5-83.el7_9.1", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2021-06-09T00:00:00Z"}, {"advisory": "RHSA-2021:2418", "cpe": "cpe:/o:redhat:rhel_aus:7.2", "package": "dhcp-12:4.2.5-42.el7_2.2", "product_name": "Red Hat Enterprise Linux 7.2 Advanced Update Support", "release_date": "2021-06-14T00:00:00Z"}, {"advisory": "RHSA-2021:2415", "cpe": "cpe:/o:redhat:rhel_aus:7.3", "package": "dhcp-12:4.2.5-47.el7_3.2", "product_name": "Red Hat Enterprise Linux 7.3 Advanced Update Support", "release_date": "2021-06-14T00:00:00Z"}, {"advisory": "RHSA-2021:2414", "cpe": "cpe:/o:redhat:rhel_aus:7.4", "package": "dhcp-12:4.2.5-58.el7_4.5", "product_name": "Red Hat Enterprise Linux 7.4 Advanced Update Support", "release_date": "2021-06-14T00:00:00Z"}, {"advisory": "RHSA-2021:2414", "cpe": "cpe:/o:redhat:rhel_tus:7.4", "package": "dhcp-12:4.2.5-58.el7_4.5", "product_name": "Red Hat Enterprise Linux 7.4 Telco Extended Update Support", "release_date": "2021-06-14T00:00:00Z"}, {"advisory": "RHSA-2021:2414", "cpe": "cpe:/o:redhat:rhel_e4s:7.4", "package": "dhcp-12:4.2.5-58.el7_4.5", "product_name": "Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions", "release_date": "2021-06-14T00:00:00Z"}, {"advisory": "RHSA-2021:2469", "cpe": "cpe:/o:redhat:rhel_aus:7.6", "package": "dhcp-12:4.2.5-69.el7_6.1", "product_name": "Red Hat Enterprise Linux 7.6 Advanced Update Support", "release_date": "2021-06-17T00:00:00Z"}, {"advisory": "RHSA-2021:2469", "cpe": "cpe:/o:redhat:rhel_tus:7.6", "package": "dhcp-12:4.2.5-69.el7_6.1", "product_name": "Red Hat Enterprise Linux 7.6 Telco Extended Update Support", "release_date": "2021-06-17T00:00:00Z"}, {"advisory": "RHSA-2021:2469", "cpe": "cpe:/o:redhat:rhel_e4s:7.6", "package": "dhcp-12:4.2.5-69.el7_6.1", "product_name": "Red Hat Enterprise Linux 7.6 Update Services for SAP Solutions", "release_date": "2021-06-17T00:00:00Z"}, {"advisory": "RHSA-2021:2405", "cpe": "cpe:/o:redhat:rhel_eus:7.7", "package": "dhcp-12:4.2.5-77.el7_7.1", "product_name": "Red Hat Enterprise Linux 7.7 Extended Update Support", "release_date": "2021-06-14T00:00:00Z"}, {"advisory": "RHSA-2021:2359", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "dhcp-12:4.3.6-44.el8_4.1", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-06-09T00:00:00Z"}, {"advisory": "RHSA-2021:2416", "cpe": "cpe:/o:redhat:rhel_eus:8.1", "package": "dhcp-12:4.3.6-34.el8_1.2", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2021-06-14T00:00:00Z"}, {"advisory": "RHSA-2021:2420", "cpe": "cpe:/o:redhat:rhel_eus:8.2", "package": "dhcp-12:4.3.6-40.el8_2.2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-06-14T00:00:00Z"}, {"advisory": "RHSA-2021:2555", "cpe": "cpe:/a:redhat:openshift:4.7::el7", "package": "cri-o-0:1.20.3-6.rhaos4.7.git0d0f863.el8", "product_name": "Red Hat OpenShift Container Platform 4.7", "release_date": "2021-07-06T00:00:00Z"}, {"advisory": "RHSA-2021:2555", "cpe": "cpe:/a:redhat:openshift:4.7::el7", "package": "dhcp-12:4.3.6-41.el8_3.1", "product_name": "Red Hat OpenShift Container Platform 4.7", "release_date": "2021-07-06T00:00:00Z"}, {"advisory": "RHSA-2021:2555", "cpe": "cpe:/a:redhat:openshift:4.7::el7", "package": "openshift-clients-0:4.7.0-202106252127.p0.git.8b4b094.el7", "product_name": "Red Hat OpenShift Container Platform 4.7", "release_date": "2021-07-06T00:00:00Z"}, {"advisory": "RHSA-2021:2555", "cpe": "cpe:/a:redhat:openshift:4.7::el7", "package": "openshift-kuryr-0:4.7.0-202106232224.p0.git.c7654fb.el8", "product_name": "Red Hat OpenShift Container Platform 4.7", "release_date": "2021-07-06T00:00:00Z"}, {"advisory": "RHSA-2021:2555", "cpe": "cpe:/a:redhat:openshift:4.7::el7", "package": "polkit-0:0.115-11.el8_3.2", "product_name": "Red Hat OpenShift Container Platform 4.7", "release_date": "2021-07-06T00:00:00Z"}, {"advisory": "RHSA-2021:2519", "cpe": "cpe:/o:redhat:enterprise_linux:7::hypervisor", "package": "redhat-virtualization-host-0:4.3.16-20210615.0.el7_9", "product_name": "Red Hat Virtualization 4 for Red Hat Enterprise Linux 7", "release_date": "2021-06-22T00:00:00Z"}], "bugzilla": {"description": "dhcp: stack-based buffer overflow when parsing statements with colon-separated hex digits in config or lease files in dhcpd and dhclient", "id": "1963258", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1963258"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-119", "details": ["In ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16, ISC DHCP 4.4.0 -> 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in lack of service to clients. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. if the dhcpd server binary was built for a 64-bit architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not occur, but it is possible for the offending lease and the lease which immediately followed it to be improperly deleted.", "A flaw was found in the Dynamic Host Configuration Protocol (DHCP). There is a discrepancy between the code that handles encapsulated option information in leases transmitted \"on the wire\" and the code which reads and parses lease information after it has been written to disk storage. This flaw allows an attacker to deliberately cause a situation where dhcpd while running in DHCPv4 or DHCPv6 mode, or the dhclient attempts to read a stored lease that contains option information, to trigger a stack-based buffer overflow in the option parsing code for colon-separated hex digits values. The highest threat from this vulnerability is to data confidentiality and integrity as well as service availability."], "name": "CVE-2021-25217", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "dhcp", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2021-05-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-25217\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-25217\nhttps://kb.isc.org/docs/cve-2021-25217"], "statement": "To abuse this flaw an attacker has to be on the same local sub-net of the victim machine. An attacker may send crafted DHCP messages with long lease statements that, when stored locally on file and then re-read by dhclient or dhcpd, might trigger the bug.", "threat_severity": "Important", "upstream_fix": "dhcp 4.4.2-P1, dhcp 4.1-ESV-R16-P1"}