CVE-2021-28507

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Arista recommends customers move to the latest version of each release. \nCVE-2021-28507 has been fixed in the following releases:\n4.26.3M and later releases in the 4.26.x train\n4.25.6M and later releases in the 4.25.x train\n4.25.4.1M and later releases in the 4.25.4.x train\n4.24.8M and later releases in the 4.24.x train\n4.23.10M and later releases in the 4.23.x train"}], "source": {"advisory": "71", "defect": ["BUG", "606248"], "discovery": "EXTERNAL"}, "title": "An issue has recently been discovered in Arista EOS where, under certain conditions, the service ACL configured for OpenConfig gNOI and OpenConfig RESTCONF might be bypassed, which results in the denied requests being forwarded to the agent.", "workarounds": [{"lang": "en", "value": "On the affected versions, all vulnerabilities can be mitigated by disabling OpenConfig gNMI/gNOI and OpenConfig RESTCONF and TerminAttr. 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The hotfix can be downloaded at https://www.arista.com/en/support/advisories-notices/sa-download/?sa=71-SecurityAdvisory0071Hotfix.i386.swix for 32 bit systems and https://www.arista.com/en/support/advisories-notices/sa-download/?sa=71-SecurityAdvisory0071Hotfix.x86_64.swix for 64 bit systems."}], "x_generator": {"engine": "Vulnogram 0.0.9"}, "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "psirt@arista.com", "DATE_PUBLIC": "2022-01-11T22:22:00.000Z", "ID": "CVE-2021-28507", "STATE": "PUBLIC", "TITLE": "An issue has recently been discovered in Arista EOS where, under certain conditions, the service ACL configured for OpenConfig gNOI and OpenConfig RESTCONF might be bypassed, which results in the denied requests being forwarded to the agent."}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "EOS", "version": {"version_data": [{"version_affected": "<=", "version_name": "4.26.2F", "version_value": "4.26.0"}, {"version_affected": "<=", "version_name": "4.25.5.1M", "version_value": "4.25.5"}, {"version_affected": "<=", "version_name": "4.25.4M", "version_value": "4.25.4"}, {"version_affected": "<=", "version_name": "4.25.3", "version_value": "4.25.0"}, {"version_affected": "<=", "version_name": "4.24.7M", "version_value": "4.24.0"}, {"version_affected": "<=", "version_name": "4.23.9M", "version_value": "4.23.0"}, {"version_affected": "=", "version_name": "4.22.x", "version_value": "4.22.x"}, {"version_affected": "<=", "version_name": "4.21.x", "version_value": "4.21.x"}]}}]}, "vendor_name": "Arista Networks"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "An issue has recently been discovered in Arista EOS where, under certain conditions, the service ACL configured for OpenConfig gNOI and OpenConfig RESTCONF might be bypassed, which results in the denied requests being forwarded to the agent."}]}, "generator": {"engine": "Vulnogram 0.0.9"}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:N", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-284 Improper Access Control"}]}]}, "references": {"reference_data": [{"name": "https://www.arista.com/en/support/advisories-notices/security-advisories/13449-security-advisory-0071", "refsource": "MISC", "url": "https://www.arista.com/en/support/advisories-notices/security-advisories/13449-security-advisory-0071"}]}, "solution": [{"lang": "en", "value": "The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release. \nCVE-2021-28507 has been fixed in the following releases:\n4.26.3M and later releases in the 4.26.x train\n4.25.6M and later releases in the 4.25.x train\n4.25.4.1M and later releases in the 4.25.4.x train\n4.24.8M and later releases in the 4.24.x train\n4.23.10M and later releases in the 4.23.x train"}], "source": {"advisory": "71", "defect": ["BUG", "606248"], "discovery": "EXTERNAL"}, "work_around": [{"lang": "en", "value": "On the affected versions, all vulnerabilities can be mitigated by disabling OpenConfig gNMI/gNOI and OpenConfig RESTCONF and TerminAttr. If use of these agents is required, a hotfix employing a proxy service can be deployed."}, {"lang": "en", "value": "To mitigate CVE-2021-28507 with the continued use of the affected agents, a hotfix employing a proxy service can be deployed. The proxy is configured behind the gNMI/gNOI or RESTCONF server. 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{"affected": [{"affectedData": [{"product": "EOS", "vendor": "Arista Networks", "versions": [{"status": "affected", "version": "4.22.x"}, {"lessThanOrEqual": "4.26.0", "status": "affected", "version": "4.26.2F", "versionType": "custom"}, {"lessThanOrEqual": "4.25.5", "status": "affected", "version": "4.25.5.1M", "versionType": "custom"}, {"lessThanOrEqual": "4.25.4", "status": "affected", "version": "4.25.4M", "versionType": "custom"}, {"lessThanOrEqual": "4.25.0", "status": "affected", "version": "4.25.3", "versionType": "custom"}, {"lessThanOrEqual": "4.24.0", "status": "affected", "version": "4.24.7M", "versionType": "custom"}, {"lessThanOrEqual": "4.23.0", "status": "affected", "version": "4.23.9M", "versionType": "custom"}, {"lessThanOrEqual": "4.21.x", "status": "affected", "version": "4.21.x", "versionType": "custom"}]}], "source": "psirt@arista.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*", "matchCriteriaId": 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under certain conditions, the service ACL configured for OpenConfig gNOI and OpenConfig RESTCONF might be bypassed, which results in the denied requests being forwarded to the agent."}, {"lang": "es", "value": "Se ha detectado recientemente un problema en Arista EOS donde, bajo determinadas condiciones, la ACL de servicio configurada para OpenConfig gNOI y OpenConfig RESTCONF podr\u00eda saltarse, lo que hace que las peticiones denegadas se reenv\u00eden al agente"}], "id": "CVE-2021-28507", "lastModified": "2026-06-17T03:46:29.230", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "NONE", "baseScore": 4.9, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:S/C:P/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 6.8, "impactScore": 4.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 1.2, "impactScore": 4.2, "source": "psirt@arista.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 4.2, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2022-01-14T20:15:10.383", "references": [{"source": "psirt@arista.com", "tags": ["Exploit", "Mitigation", "Patch", "Vendor Advisory"], "url": "https://www.arista.com/en/support/advisories-notices/security-advisories/13449-security-advisory-0071"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Mitigation", "Patch", "Vendor Advisory"], "url": "https://www.arista.com/en/support/advisories-notices/security-advisories/13449-security-advisory-0071"}], "sourceIdentifier": "psirt@arista.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-284"}], "source": "psirt@arista.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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