What’s Vulnerable › Vulnerabilities
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.
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-06-04 · updated 2026-07-22
- Weakness: CWE-284
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.
Affected products
- Arista Networks EOS: from 4.32.0 through 4.32.0.1F; from 4.31.0 through 4.31.2F; from 4.30.0 through 4.30.6M; from 4.29.0 through 4.29.7M; from 4.28.0 through 4.28.10.1M; from 4.27.2F before 4.28.0 — fixed in 4.28.0
How to fix
Upgrade to a fixed version: Arista Networks EOS 4.28.0. Check the vendor advisory for mitigations.
References
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