What’s Vulnerable › Vulnerabilities

CVE-2020-26569

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-12-28 · updated 2026-06-17

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.

Affected products

• Arista Networks EOS: from 4.21.0f through 4.21.12m; from 4.22.0f through 4.22.7m; from 4.23.0f through 4.23.5m; from 4.24.0f through 4.24.2f

References

• https://www.arista.com/en/support/advisories-notices/security-advisories/11997-security-advisory-57
• https://www.arista.com/en/support/advisories-notices/security-advisories/11997-security-advisory-57

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