{ "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": [ { "refsource": "MISC", "url": "https://www.arista.com/en/support/advisories-notices/security-advisories/15267-security-advisory-0073", "name": "https://www.arista.com/en/support/advisories-notices/security-advisories/15267-security-advisory-0073" } ] }, "solution": [ { "lang": "eng", "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": "eng", "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." } ] }