{"id":"CVE-2021-28505","state":"PUBLISHED","title":"On affected Arista EOS platforms, if a VXLAN match rule exists in an IPv4 access-list that is applied to the ingress of an L2 or an L3 port/SVI, the VXLAN rule and subsequent ACL rules in that access list will ignore the specified IP protocol.","description":"On affected Arista EOS platforms, if a VXLAN match rule exists in an IPv4 access-list that is applied to the ingress of an L2 or an L3 port/SVI, the VXLAN rule and subsequent ACL rules in that access list will ignore the specified IP protocol.","publishedAt":"2022-04-14T20:05:50.059Z","updatedAt":"2024-09-16T16:58:06.559Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","source":"Arista"},"assigner":"Arista","products":["Arista Networks EOS"],"affected":[{"vendor":"Arista Networks","product":"EOS","versions":[{"version":"4.26.3M","status":"affected","lessThanOrEqual":"4.26.0","versionType":"custom"},{"version":"4.27.0F","status":"affected","lessThanOrEqual":"4.27.0","versionType":"custom"}]}],"references":["https://www.arista.com/en/support/advisories-notices/security-advisories/15267-security-advisory-0073"],"weaknesses":["CWE-284"],"ingestedAt":"2026-10-29T19:48:19.096Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/28xxx/CVE-2021-28505.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-28505","state":"PUBLISHED","datePublished":"2022-04-14T20:05:50.059Z","dateUpdated":"2024-09-16T16:58:06.559Z","assignerShortName":"Arista","assignerOrgId":"c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7","dateReserved":"2021-03-16T00:00:00.000Z"},"containers":{"cna":{"title":"On affected Arista EOS platforms, if a VXLAN match rule exists in an IPv4 access-list that is applied to the ingress of an L2 or an L3 port/SVI, the VXLAN rule and subsequent ACL rules in that access list will ignore the specified IP protocol.","descriptions":[{"lang":"en","value":"On affected Arista EOS platforms, if a VXLAN match rule exists in an IPv4 access-list that is applied to the ingress of an L2 or an L3 port/SVI, the VXLAN rule and subsequent ACL rules in that access list will ignore the specified IP protocol."}],"affected":[{"vendor":"Arista Networks","product":"EOS","versions":[{"version":"4.26.3M","status":"affected","lessThanOrEqual":"4.26.0","versionType":"custom"},{"version":"4.27.0F","status":"affected","lessThanOrEqual":"4.27.0","versionType":"custom"}]}],"references":[{"url":"https://www.arista.com/en/support/advisories-notices/security-advisories/15267-security-advisory-0073","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-284","description":"CWE-284 Improper Access Control","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"Arista","dateUpdated":"2022-04-14T20:05:50.000Z","orgId":"c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7"},"datePublic":"2022-03-29T00:00:00.000Z","solutions":[{"lang":"en","value":"The recommended resolution is to upgrade to a remediated software version at your earliest convenience.\nArtista recommends customers move to the latest version of each release that contains all the fixes listed below.\n\nCVE-2021-28505 has been fixed in the following releases:\n\n4.26.4M and later releases in the 4.26.x train\n4.27.1F and later releases in the 4.27.x train"}],"source":{"advisory":"73","defect":["BUG","609752"],"discovery":"INTERNAL"},"workarounds":[{"lang":"en","value":"Replace \"vxlan\" IP protocol match with match on IP protocol \"udp\" and Layer 4 destination port for VxLAN encapsulated packets i.e 4789. < br/> If VXLAN L4 destination port number is not the default 4789 then use the configured L4 destination port number."}],"x_generator":{"engine":"Vulnogram 0.0.9"},"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"psirt@arista.com","DATE_PUBLIC":"2022-03-29T21:53:00.000Z","ID":"CVE-2021-28505","STATE":"PUBLIC","TITLE":"On affected Arista EOS platforms, if a VXLAN match rule exists in an IPv4 access-list that is applied to the ingress of an L2 or an L3 port/SVI, the VXLAN rule and subsequent ACL rules in that access list will ignore the specified IP protocol."},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"EOS","version":{"version_data":[{"version_affected":"<=","version_name":"4.26.3M","version_value":"4.26.0"},{"version_affected":"<=","version_name":"4.27.0F","version_value":"4.27.0"}]}}]},"vendor_name":"Arista Networks"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"On affected Arista EOS platforms, if a VXLAN match rule exists in an IPv4 access-list that is applied to the ingress of an L2 or an L3 port/SVI, the VXLAN rule and subsequent ACL rules in that access list will ignore the specified IP protocol."}]},"generator":{"engine":"Vulnogram 0.0.9"},"impact":{"cvss":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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/15267-security-advisory-0073","refsource":"MISC","url":"https://www.arista.com/en/support/advisories-notices/security-advisories/15267-security-advisory-0073"}]},"solution":[{"lang":"en","value":"The recommended resolution is to upgrade to a remediated software version at your earliest convenience.\nArtista recommends customers move to the latest version of each release that contains all the fixes listed below.\n\nCVE-2021-28505 has been fixed in the following releases:\n\n4.26.4M and later releases in the 4.26.x train\n4.27.1F and later releases in the 4.27.x train"}],"source":{"advisory":"73","defect":["BUG","609752"],"discovery":"INTERNAL"},"work_around":[{"lang":"en","value":"Replace \"vxlan\" IP protocol match with match on IP protocol \"udp\" and Layer 4 destination port for VxLAN encapsulated packets i.e 4789. < br/> If VXLAN L4 destination port number is not the default 4789 then use the configured L4 destination port number."}]}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://www.arista.com/en/support/advisories-notices/security-advisories/15267-security-advisory-0073","tags":["x_refsource_MISC","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-03T21:47:32.647Z"}}]}}}