How severe is CVE-2024-27891?

CVE-2024-27891 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2024-27891 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2024-27891?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2024-27891 have an EU (EUVD) identifier?

Yes. CVE-2024-27891 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-55611.

When was CVE-2024-27891 published?

CVE-2024-27891 was published on 2026-06-04 and last updated on 2026-06-17.

CVE-2024-27891

CVE-2024-27891 is a medium-severity vulnerability with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-284.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 6.9
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-55611
Weakness: CWE-284
Published: 2026-06-04
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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. This can cause outgoing packets to incorrectly be allowed or denied.
How severe is CVE-2024-27891?: CVE-2024-27891 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2024-27891 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2024-27891?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2024-27891 have an EU (EUVD) identifier?: Yes. CVE-2024-27891 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-55611.
When was CVE-2024-27891 published?: CVE-2024-27891 was published on 2026-06-04 and last updated on 2026-06-17.

References

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

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