6.9

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.

Awaiting analysis
Published 04-06-2026Last modified 05-06-2026

Vulnerability summary

CVE-2024-27891 is a medium (CVSS 6.9) Improper Access Control vulnerability in arista networks eos. EPSS estimates a 0.28% chance of exploitation in the next 30 days, higher than 19.5% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.9/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.28%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 04-06-2026
    PublishedVulnerability first disclosed.
  2. 05-06-2026
    Last modifiedVulnerability information updated.

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 metrics

4 scores · 2 sources · 2 versions

EPSS trend

Probability

0.28%

Chance of exploitation in the next 30 days

Percentile

20%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.28% on 22-09-2026

22-09-202622-10-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Arista networks1 product
  • eos≥ 4.32.0, ≤ 4.32.0.1F | ≥ 4.31.0, ≤ 4.31.2F | ≥ 4.30.0, ≤ 4.30.6M | ≥ 4.29.0, ≤ 4.29.7M | ≥ 4.28.0, ≤ 4.28.10.1M | ≥ 4.27.2F, < 4.28.0

1 vendor · 1 product

References

1 links