CVE-2023-5632 - Vulnerability Details - OpenCVE

In Eclipse Mosquito before and including 2.0.5, establishing a connection to the mosquitto server without sending data causes the EPOLLOUT event to be added, which results excessive CPU consumption. This could be used by a malicious actor to perform denial of service type attack. This issue is fixed in 2.0.6

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00091.

Key SSVC decision points have not yet been added.

Vendors	Products
Eclipse	Mosquitto

Configuration 1 [-]

cpe:2.3:a:eclipse:mosquitto:2.0.5:*:*:*:*:*:*:*

No data.

No data.

Advisories

Source	ID	Title
EUVD	EUVD-2023-57925	In Eclipse Mosquito before and including 2.0.5, establishing a connection to the mosquitto server without sending data causes the EPOLLOUT event to be added, which results excessive CPU consumption. This could be used by a malicious actor to perform denial of service type attack. This issue is fixed in 2.0.6

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References

Link	Providers
https://github.com/eclipse/mosquitto/commit/18bad1ff32435e523d7507e9b2ce0010124a8f2d
https://github.com/eclipse/mosquitto/pull/2053
https://nvd.nist.gov/vuln/detail/CVE-2023-5632
https://www.cve.org/CVERecord?id=CVE-2023-5632

History

Wed, 25 Jun 2025 21:15:00 +0000

Type	Values Removed	Values Added
CPEs	cpe:2.3:a:eclipse:mosquitto::::::::	cpe:2.3:a:eclipse:mosquitto:2.0.5:::::::*

MITRE

Status: PUBLISHED

Assigner: eclipse

Published: 2023-10-18T08:34:34.788Z

Updated: 2024-09-13T14:50:24.704Z

Reserved: 2023-10-18T08:17:55.102Z

Link: CVE-2023-5632

Vulnrichment

Updated: 2024-08-02T08:07:32.289Z

NVD

Status : Analyzed

Published: 2023-10-18T09:15:10.080

Modified: 2025-06-25T20:53:55.653

Link: CVE-2023-5632

Redhat

Severity : Moderate

Publid Date: 2023-10-18T00:00:00Z

Links: CVE-2023-5632 - Bugzilla

OpenCVE Enrichment

No data.

{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2023-5632", "assignerOrgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c", "state": "PUBLISHED", "assignerShortName": "eclipse", "dateReserved": "2023-10-18T08:17:55.102Z", "datePublished": "2023-10-18T08:34:34.788Z", "dateUpdated": "2024-09-13T14:50:24.704Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "Mosquitto", "programFiles": ["https://github.com/eclipse/mosquitto/blob/master/lib/packet_mosq.c"], "repo": "https://github.com/eclipse/mosquitto", "vendor": "Eclipse", "versions": [{"lessThanOrEqual": "2.0.5", "status": "affected", "version": "0", "versionType": "custom"}]}], "credits": [{"lang": "en", "type": "finder", "user": "00000000-0000-4000-9000-000000000000", "value": "Przemys\u0142aw Zygmunt (acsoftware.pl)"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<div>In Eclipse Mosquito before and including 2.0.5, establishing a connection to the mosquitto server without sending data causes the EPOLLOUT event to be added, which results excessive CPU consumption. This could be used by a malicious actor to perform denial of service type attack. This issue is fixed in 2.0.6<br></div>"}], "value": "In Eclipse Mosquito before and including 2.0.5, establishing a connection to the mosquitto server without sending data causes the EPOLLOUT event to be added, which results excessive CPU consumption. This could be used by a malicious actor to perform denial of service type attack. This issue is fixed in 2.0.6\n\n\n"}], "impacts": [{"capecId": "CAPEC-130", "descriptions": [{"lang": "en", "value": "CAPEC-130 Excessive Allocation"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-834", "description": "CWE-834 Excessive Iteration", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c", "shortName": "eclipse", "dateUpdated": "2023-10-18T08:34:34.788Z"}, "references": [{"tags": ["patch", "issue-tracking"], "url": "https://github.com/eclipse/mosquitto/pull/2053"}, {"tags": ["patch"], "url": "https://github.com/eclipse/mosquitto/commit/18bad1ff32435e523d7507e9b2ce0010124a8f2d"}], "source": {"discovery": "UNKNOWN"}, "title": "Unconditionally adding an event to the epoll causes excessive CPU consumption", "x_generator": {"engine": "Vulnogram 0.1.0-dev"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T08:07:32.289Z"}, "title": "CVE Program Container", "references": [{"tags": ["patch", "issue-tracking", "x_transferred"], "url": "https://github.com/eclipse/mosquitto/pull/2053"}, {"tags": ["patch", "x_transferred"], "url": "https://github.com/eclipse/mosquitto/commit/18bad1ff32435e523d7507e9b2ce0010124a8f2d"}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-09-13T14:50:16.055664Z", "id": "CVE-2023-5632", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-13T14:50:24.704Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://github.com/eclipse/mosquitto/pull/2053", "tags": ["patch", "issue-tracking", "x_transferred"]}, {"url": "https://github.com/eclipse/mosquitto/commit/18bad1ff32435e523d7507e9b2ce0010124a8f2d", "tags": ["patch", "x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T08:07:32.289Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2023-5632", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-13T14:50:16.055664Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-13T14:50:20.575Z"}}], "cna": {"title": "Unconditionally adding an event to the epoll causes excessive CPU consumption", "source": {"discovery": "UNKNOWN"}, "credits": [{"lang": "en", "type": "finder", "user": "00000000-0000-4000-9000-000000000000", "value": "Przemys\u0142aw Zygmunt (acsoftware.pl)"}], "impacts": [{"capecId": "CAPEC-130", "descriptions": [{"lang": "en", "value": "CAPEC-130 Excessive Allocation"}]}], "metrics": [{"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"repo": "https://github.com/eclipse/mosquitto", "vendor": "Eclipse", "product": "Mosquitto", "versions": [{"status": "affected", "version": "0", "versionType": "custom", "lessThanOrEqual": "2.0.5"}], "programFiles": ["https://github.com/eclipse/mosquitto/blob/master/lib/packet_mosq.c"], "defaultStatus": "unaffected"}], "references": [{"url": "https://github.com/eclipse/mosquitto/pull/2053", "tags": ["patch", "issue-tracking"]}, {"url": "https://github.com/eclipse/mosquitto/commit/18bad1ff32435e523d7507e9b2ce0010124a8f2d", "tags": ["patch"]}], "x_generator": {"engine": "Vulnogram 0.1.0-dev"}, "descriptions": [{"lang": "en", "value": "In Eclipse Mosquito before and including 2.0.5, establishing a connection to the mosquitto server without sending data causes the EPOLLOUT event to be added, which results excessive CPU consumption. This could be used by a malicious actor to perform denial of service type attack. This issue is fixed in 2.0.6\n\n\n", "supportingMedia": [{"type": "text/html", "value": "<div>In Eclipse Mosquito before and including 2.0.5, establishing a connection to the mosquitto server without sending data causes the EPOLLOUT event to be added, which results excessive CPU consumption. This could be used by a malicious actor to perform denial of service type attack. This issue is fixed in 2.0.6<br></div>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-834", "description": "CWE-834 Excessive Iteration"}]}], "providerMetadata": {"orgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c", "shortName": "eclipse", "dateUpdated": "2023-10-18T08:34:34.788Z"}}}, "cveMetadata": {"cveId": "CVE-2023-5632", "state": "PUBLISHED", "dateUpdated": "2024-09-13T14:50:24.704Z", "dateReserved": "2023-10-18T08:17:55.102Z", "assignerOrgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c", "datePublished": "2023-10-18T08:34:34.788Z", "assignerShortName": "eclipse"}, "dataVersion": "5.1"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:eclipse:mosquitto:2.0.5:*:*:*:*:*:*:*", "matchCriteriaId": "031399B7-F6D7-443C-9F3E-184ADA2B2ADA", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In Eclipse Mosquito before and including 2.0.5, establishing a connection to the mosquitto server without sending data causes the EPOLLOUT event to be added, which results excessive CPU consumption. This could be used by a malicious actor to perform denial of service type attack. This issue is fixed in 2.0.6\n\n\n"}, {"lang": "es", "value": "En Eclipse Mosquito anterior a 2.0.5 incluida, establecer una conexi\u00f3n con el servidor mosquitto sin enviar datos provoca que se agregue el evento EPOLLOUT, lo que resulta en un consumo excesivo de CPU. Esto podr\u00eda ser utilizado por un actor malintencionado para realizar un ataque de tipo de denegaci\u00f3n de servicio. Este problema se solucion\u00f3 en 2.0.6."}], "id": "CVE-2023-5632", "lastModified": "2025-06-25T20:53:55.653", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "emo@eclipse.org", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2023-10-18T09:15:10.080", "references": [{"source": "emo@eclipse.org", "tags": ["Patch"], "url": "https://github.com/eclipse/mosquitto/commit/18bad1ff32435e523d7507e9b2ce0010124a8f2d"}, {"source": "emo@eclipse.org", "tags": ["Issue Tracking"], "url": "https://github.com/eclipse/mosquitto/pull/2053"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://github.com/eclipse/mosquitto/commit/18bad1ff32435e523d7507e9b2ce0010124a8f2d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking"], "url": "https://github.com/eclipse/mosquitto/pull/2053"}], "sourceIdentifier": "emo@eclipse.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-834"}], "source": "emo@eclipse.org", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-834"}], "source": "nvd@nist.gov", "type": "Primary"}]}