CVE-2024-27891

On affected platforms running Arista EOS with MACsec and egress ACLs configured on the same interfaces, the ACL policies may not be enforced for packets egressing on those ports.

State: Published
Severity: 6.9 Medium
Published: Jun 4, 2026
Updated: Jun 5, 2026
Reserved: Feb 26, 2024

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Description

On affected platforms running Arista EOS with MACsec and egress ACLs configured on the same interfaces, the ACL policies may not be enforced for packets egressing on those ports. This can cause outgoing packets to incorrectly be allowed or denied.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N	Arista
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N	Arista

Weaknesses

CWE-284 Improper Access Control

Affected Products

Product	Versions
EOSArista Networks	4.32.0 through 4.32.0.1FAffected 4.31.0 through 4.31.2FAffected 4.30.0 through 4.30.6MAffected 4.29.0 through 4.29.7MAffected 4.28.0 through 4.28.10.1MAffected 4.27.2F to before 4.28.0Affected

References

https://www.arista.com/en/support/advisories-notices/security-advisory/19908-security-advisory-0102

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