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PatchSiren cyber security CVE debrief

CVE-2024-27890 Arista Networks CVE debrief

CVE-2024-27890 is a HIGH-severity vulnerability affecting Arista EOS with OpenConfig configured. A gNMI Set request can be run when it should have been rejected, resulting in unexpected configuration being applied to the switch. The CVSS score for this vulnerability is 7.2.

Vendor
Arista Networks
Product
EOS
CVSS
HIGH 7.2
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-04
Original CVE updated
2026-07-22
Advisory published
2026-06-04
Advisory updated
2026-07-22

Who should care

Users of Arista EOS with OpenConfig configured should be aware of this vulnerability and take necessary actions to mitigate it.

Technical summary

A gNMI Set request can be run when it should have been rejected, resulting in unexpected configuration being applied to the switch.

Defensive priority

HIGH

Recommended defensive actions

  • Apply patches or mitigations as recommended by the vendor.
  • Review and update configurations to prevent exploitation.

Evidence notes

Vendor: Arista (from reference_domain_candidate)

Sources and references

Verified primary and authoritative sources

  • CVE-2024-27890 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-27890

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2024-27890 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-27890

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://www.arista.com/en/support/advisories-notices/security-advisory/19862-security-advisory-0099

    [email protected]

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.