# CVE-2026-73456

Unauthenticated RCE in Arista EOS gNPSI allows full administrative takeover of switches.

- Page: https://www.vulneraibility.com/cve/CVE-2026-73456
- CVSS: 9.2
- Known exploited: not in CISA KEV as of our last sync
- EPSS: 0.69% (percentile 53.0)
- CISA SSVC: exploitation none, automatable yes, technical impact total (assessed 2026-09-17)
- Weakness: CWE-94
- Published: 2026-09-16

## Affected versions

- Arista Networks EOS: affected >= 4.36.0 and <= 4.36.1F; >= 4.35.0 and <= 4.35.5M; >= 4.34.2F and <= 4.34.7M

A version outside these ranges is not a statement that it is unaffected.

## Impact

Unauthenticated remote code execution via gNPSI request, granting full administrative control of affected switches and network disruption.

## Action

Immediate action required

## Recommendation

Isolate/segment management plane, disable gNPSI, apply vendor updates from advisory when available

## References

- [advisory] https://www.arista.com/en/support/advisories-notices/security-advisory/24714-security-advisory-0158

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.