CVE-2024-27891

MEDIUMPre-NVD 5.35.3—Trending — 3 sources updated this week

5.3

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 v3: 5.3
EG Score: 5.3(high)
EPSS: 31.3%
KEV: Not listed

Published

June 4, 2026

Last Modified

June 5, 2026

References (1)

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

Vendor Advisories for CVE-2024-27891(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

GHSA-6r39-6chc-xxhc
GitHub Security AdvisoriesMedium
On affected platforms running Arista EOS with MACsec and egress ACLs configured on the same...

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-284Improper Access Control

Data Freshness Timeline

(refreshed 5× in last 7d / 5× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-06 00:36 UTCEG score recompute
2026-06-06 00:36 UTCGHSA enrichment
2026-06-05 22:46 UTCepss_batch
2026-06-05 22:46 UTCepss_batch
2026-06-04 22:45 UTCEG score recompute

Frequently asked(5)

What is CVE-2024-27891?

CVE-2024-27891 is a medium vulnerability published on June 4, 2026. 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.

When was CVE-2024-27891 disclosed?

CVE-2024-27891 was first published in the National Vulnerability Database on June 4, 2026, with the most recent update on June 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2024-27891 actively exploited?

CVE-2024-27891 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 31.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2024-27891?

CVE-2024-27891 has a CVSS v3 base score of 5.3 (NVD).

How do I remediate CVE-2024-27891?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-27891, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2024-27891

📅 Published

🔄 Last Modified

🔗 References (1)

📣 Vendor Advisories for CVE-2024-27891(1)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)