{"id":"CVE-2020-26569","aliases":["EUVD-2020-19114","GHSA-77mv-h93c-9885"],"status":"published","title":"In EVPN VxLAN setups in Arista EOS, specific malformed packets can lead to incorrect MAC to IP...","description":"In EVPN VxLAN setups in Arista EOS, specific malformed packets can lead to incorrect MAC to IP bindings and as a result packets can be incorrectly forwarded across VLAN boundaries. This can result in traffic being discarded on the receiving VLAN. This affects versions: 4.21.12M and below releases in the 4.21.x train; 4.22.7M and below releases in the 4.22.x train; 4.23.5M and below releases in the 4.23.x train; 4.24.2F and below releases in the 4.24.x train.","severity":{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.00851,"percentile":0.58462,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2020-12-28T15:52:48Z","modified":"2026-06-17T03:08:13Z","products":[{"vendor":"arista","product":"eos"}],"references":[{"url":"https://www.arista.com/en/support/advisories-notices/security-advisories/11997-security-advisory-57","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-26569"},{"url":"https://github.com/advisories/GHSA-77mv-h93c-9885"}],"sources":{"cve":[{"id":"CVE-2020-26569","description":"In EVPN VxLAN setups in Arista EOS, specific malformed packets can lead to incorrect MAC to IP bindings and as a result packets can be incorrectly forwarded across VLAN boundaries. This can result in traffic being discarded on the receiving VLAN. This affects versions: 4.21.12M and below releases in the 4.21.x train; 4.22.7M and below releases in the 4.22.x train; 4.23.5M and below releases in the 4.23.x train; 4.24.2F and below releases in the 4.24.x train.","status":"published","published":"2020-12-28T15:52:48Z","modified":"2024-08-04T15:56:04.942Z","updated_at":"2026-11-02T14:35:46.129376Z"}],"euvd":[{"id":"EUVD-2020-19114","description":"In EVPN VxLAN setups in Arista EOS, specific malformed packets can lead to incorrect MAC to IP bindings and as a result packets can be incorrectly forwarded across VLAN boundaries. This can result in traffic being discarded on the receiving VLAN. This affects versions: 4.21.12M and below releases in the 4.21.x train; 4.22.7M and below releases in the 4.22.x train; 4.23.5M and below releases in the 4.23.x train; 4.24.2F and below releases in the 4.24.x train.","status":"published","published":"2020-12-28T15:52:48Z","modified":"2024-08-04T15:56:04Z","updated_at":"2026-11-03T03:07:15.15938Z"}],"ghsa":[{"id":"GHSA-77mv-h93c-9885","title":"In EVPN VxLAN setups in Arista EOS, specific malformed packets can lead to incorrect MAC to IP...","description":"In EVPN VxLAN setups in Arista EOS, specific malformed packets can lead to incorrect MAC to IP bindings and as a result packets can be incorrectly forwarded across VLAN boundaries. This can result in traffic being discarded on the receiving VLAN. This affects versions: 4.21.12M and below releases in the 4.21.x train; 4.22.7M and below releases in the 4.22.x train; 4.23.5M and below releases in the 4.23.x train; 4.24.2F and below releases in the 4.24.x train.","status":"published","published":"2022-05-24T17:37:24Z","modified":"2023-01-29T05:04:51Z","updated_at":"2026-11-02T14:45:39.24589Z"}],"nvd":[{"id":"CVE-2020-26569","description":"In EVPN VxLAN setups in Arista EOS, specific malformed packets can lead to incorrect MAC to IP bindings and as a result packets can be incorrectly forwarded across VLAN boundaries. This can result in traffic being discarded on the receiving VLAN. This affects versions: 4.21.12M and below releases in the 4.21.x train; 4.22.7M and below releases in the 4.22.x train; 4.23.5M and below releases in the 4.23.x train; 4.24.2F and below releases in the 4.24.x train.","status":"published","published":"2020-12-28T16:15:12.87Z","modified":"2026-06-17T03:08:13.087Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:28.340168Z"}]}}