CVE-2021-3899 - Vulnerability Details - OpenCVE

There is a race condition in the 'replaced executable' detection that, with the correct local configuration, allow an attacker to execute arbitrary code as root.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

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 0.02997.

Key SSVC decision points have not yet been added.

Vendors	Products
Canonical	Apport Ubuntu Linux

Configuration 1 [-]

cpe:2.3:a:canonical:apport:*:*:*:*:*:*:*:*

Configuration 2 [-]

OR	cpe:2.3:o:canonical:ubuntu_linux:18.04::::lts:::
	cpe:2.3:o:canonical:ubuntu_linux:20.04::::lts:::
	cpe:2.3:o:canonical:ubuntu_linux:21.10:::::::*
	cpe:2.3:o:canonical:ubuntu_linux:22.04::::lts:::

No data.

No data.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References

Link	Providers
https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1948376
https://ubuntu.com/security/notices/USN-5427-1
https://www.cve.org/CVERecord?id=CVE-2021-3899

History

Tue, 26 Aug 2025 17:30:00 +0000

Type	Values Removed	Values Added
First Time appeared		Canonical Canonical apport Canonical ubuntu Linux
CPEs		cpe:2.3:a:canonical:apport:::::::: cpe:2.3:o:canonical:ubuntu_linux:18.04::::lts::: cpe:2.3:o:canonical:ubuntu_linux:20.04::::lts::: cpe:2.3:o:canonical:ubuntu_linux:21.10:::::::* cpe:2.3:o:canonical:ubuntu_linux:22.04::::lts:::
Vendors & Products		Canonical Canonical apport Canonical ubuntu Linux

Sat, 12 Jul 2025 13:45:00 +0000

Type	Values Removed	Values Added
Metrics	epss `{'score': 0.02053}`	epss `{'score': 0.02678}`

Mon, 19 Aug 2024 15:00:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-367
Metrics		cvssV3_1 `{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}`

MITRE

Status: PUBLISHED

Assigner: canonical

Published: 2024-06-03T18:40:32.847Z

Updated: 2024-08-19T14:10:41.358Z

Reserved: 2021-10-23T01:51:35.297Z

Link: CVE-2021-3899

Vulnrichment

Updated: 2024-08-03T17:09:09.767Z

NVD

Status : Analyzed

Published: 2024-06-03T19:15:08.940

Modified: 2025-08-26T17:21:04.500

Link: CVE-2021-3899

Redhat

No data.

OpenCVE Enrichment

No data.

{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2021-3899", "assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "state": "PUBLISHED", "assignerShortName": "canonical", "dateReserved": "2021-10-23T01:51:35.297Z", "datePublished": "2024-06-03T18:40:32.847Z", "dateUpdated": "2024-08-19T14:10:41.358Z"}, "containers": {"cna": {"affected": [{"packageName": "apport", "product": "Apport", "vendor": "Canonical Ltd.", "repo": "https://github.com/canonical/apport", "platforms": ["Linux"], "versions": [{"lessThan": "2.21.0", "status": "affected", "version": "0", "versionType": "semver"}]}], "descriptions": [{"lang": "en", "value": "There is a race condition in the 'replaced executable' detection that, with the correct local configuration, allow an attacker to execute arbitrary code as root."}], "references": [{"tags": ["issue-tracking"], "url": "https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1948376"}, {"tags": ["vendor-advisory"], "url": "https://ubuntu.com/security/notices/USN-5427-1"}, {"tags": ["issue-tracking"], "url": "https://www.cve.org/CVERecord?id=CVE-2021-3899"}], "credits": [{"lang": "en", "type": "finder", "value": "Muqing Liu from Singurlar Security Lab"}, {"lang": "en", "type": "finder", "value": "neoni"}], "providerMetadata": {"orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "shortName": "canonical", "dateUpdated": "2024-06-03T18:40:32.847Z"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T17:09:09.767Z"}, "title": "CVE Program Container", "references": [{"tags": ["issue-tracking", "x_transferred"], "url": "https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1948376"}, {"tags": ["vendor-advisory", "x_transferred"], "url": "https://ubuntu.com/security/notices/USN-5427-1"}, {"tags": ["issue-tracking", "x_transferred"], "url": "https://www.cve.org/CVERecord?id=CVE-2021-3899"}]}, {"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-367", "lang": "en", "description": "CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition"}]}], "affected": [{"vendor": "apport", "product": "apport", "cpes": ["cpe:2.3:a:apport:apport:*:*:*:*:*:*:*:*"], "defaultStatus": "unknown", "versions": [{"version": "0", "status": "affected", "lessThan": "2.21.0", "versionType": "semver"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2024-08-19T14:09:25.391252Z", "id": "CVE-2021-3899", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-08-19T14:10:41.358Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1948376", "tags": ["issue-tracking", "x_transferred"]}, {"url": "https://ubuntu.com/security/notices/USN-5427-1", "tags": ["vendor-advisory", "x_transferred"]}, {"url": "https://www.cve.org/CVERecord?id=CVE-2021-3899", "tags": ["issue-tracking", "x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T17:09:09.767Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2021-3899", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2024-08-19T14:09:25.391252Z"}}}], "affected": [{"cpes": ["cpe:2.3:a:apport:apport:*:*:*:*:*:*:*:*"], "vendor": "apport", "product": "apport", "versions": [{"status": "affected", "version": "0", "lessThan": "2.21.0", "versionType": "semver"}], "defaultStatus": "unknown"}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-367", "description": "CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-08-19T14:06:42.693Z"}}], "cna": {"credits": [{"lang": "en", "type": "finder", "value": "Muqing Liu from Singurlar Security Lab"}, {"lang": "en", "type": "finder", "value": "neoni"}], "affected": [{"repo": "https://github.com/canonical/apport", "vendor": "Canonical Ltd.", "product": "Apport", "versions": [{"status": "affected", "version": "0", "lessThan": "2.21.0", "versionType": "semver"}], "platforms": ["Linux"], "packageName": "apport"}], "references": [{"url": "https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1948376", "tags": ["issue-tracking"]}, {"url": "https://ubuntu.com/security/notices/USN-5427-1", "tags": ["vendor-advisory"]}, {"url": "https://www.cve.org/CVERecord?id=CVE-2021-3899", "tags": ["issue-tracking"]}], "descriptions": [{"lang": "en", "value": "There is a race condition in the 'replaced executable' detection that, with the correct local configuration, allow an attacker to execute arbitrary code as root."}], "providerMetadata": {"orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "shortName": "canonical", "dateUpdated": "2024-06-03T18:40:32.847Z"}}}, "cveMetadata": {"cveId": "CVE-2021-3899", "state": "PUBLISHED", "dateUpdated": "2024-08-19T14:10:41.358Z", "dateReserved": "2021-10-23T01:51:35.297Z", "assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "datePublished": "2024-06-03T18:40:32.847Z", "assignerShortName": "canonical"}, "dataVersion": "5.1"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:canonical:apport:*:*:*:*:*:*:*:*", "matchCriteriaId": "694303C9-A43B-485D-BF26-33CC797B8744", "versionEndExcluding": "2.21.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*", "matchCriteriaId": "23A7C53F-B80F-4E6A-AFA9-58EEA84BE11D", "vulnerable": true}, {"criteria": "cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*", "matchCriteriaId": "902B8056-9E37-443B-8905-8AA93E2447FB", "vulnerable": true}, {"criteria": "cpe:2.3:o:canonical:ubuntu_linux:21.10:*:*:*:*:*:*:*", "matchCriteriaId": "AAE4D2D0-CEEB-416F-8BC5-A7987DF56190", "vulnerable": true}, {"criteria": "cpe:2.3:o:canonical:ubuntu_linux:22.04:*:*:*:lts:*:*:*", "matchCriteriaId": "359012F1-2C63-415A-88B8-6726A87830DE", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "There is a race condition in the 'replaced executable' detection that, with the correct local configuration, allow an attacker to execute arbitrary code as root."}, {"lang": "es", "value": "Existe una condici\u00f3n de ejecuci\u00f3n en la detecci\u00f3n de 'ejecutable reemplazado' que, con la configuraci\u00f3n local correcta, permite a un atacante ejecutar c\u00f3digo arbitrario como root."}], "id": "CVE-2021-3899", "lastModified": "2025-08-26T17:21:04.500", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2024-06-03T19:15:08.940", "references": [{"source": "security@ubuntu.com", "tags": ["Issue Tracking", "Patch"], "url": "https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1948376"}, {"source": "security@ubuntu.com", "tags": ["Vendor Advisory"], "url": "https://ubuntu.com/security/notices/USN-5427-1"}, {"source": "security@ubuntu.com", "tags": ["Third Party Advisory"], "url": "https://www.cve.org/CVERecord?id=CVE-2021-3899"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Patch"], "url": "https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1948376"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://ubuntu.com/security/notices/USN-5427-1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.cve.org/CVERecord?id=CVE-2021-3899"}], "sourceIdentifier": "security@ubuntu.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-367"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}