Medium severity · published Jun 4, 2026
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.
5.3
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 21% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EO
EOS · Arista Networks
4.32.0 through 4.32.0.1F; 4.31.0 through 4.31.2F; 4.30.0 through 4.30.6M; 4.29.0 through 4.29.7M; 4.28.0 through 4.28.10.1M; 4.27.2F before 4.28.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-27891
CVE.org
https://www.cve.org/CVERecord?id=CVE-2024-27891
www.arista.com
https://www.arista.com/en/support/advisories-notices/security-advisory/19908-security-advisory-0102
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