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PatchSiren cyber security CVE debrief

CVE-2025-5090 Arista Networks CVE debrief

A high-severity vulnerability was discovered in CVX, which could lead to a denial-of-service (DoS) scenario. An attacker with high privilege access to a connected switch could send custom TCP packets to CVX, causing agent crashes and instability in the CVX cluster.

Vendor
Arista Networks
Product
EOS / CloudVision eXchange (CVX)
CVSS
HIGH 7.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-05
Original CVE updated
2026-06-05
Advisory published
2026-06-05
Advisory updated
2026-06-05

Who should care

Administrators and users of CVX clusters, particularly those with high-privilege access to connected switches.

Technical summary

CVX is not resilient to unexpected messages from a connected switch. This leads to agent crashes on CVX causing instability in the CVX cluster. An attacker could use this behavior to create a denial of service (DoS) scenario. Note that this would require the attacker to have a high privilege access to the connected switch to be able to send custom TCP packets to the CVX.

Defensive priority

High

Recommended defensive actions

  • Review and update CVX configurations to ensure resilience to unexpected messages.
  • Implement access controls to limit high-privilege access to connected switches.
  • Monitor CVX cluster stability and agent crashes.

Evidence notes

The vendor is identified as Arista, based on the provided evidence.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-5090 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-5090

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

  • CVE-2025-5090 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-5090

    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/22868-security-advisory-0126

    [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.