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CVE-2026-7473: Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability

criticalknown exploitedpublic exploitCVE-2026-7473
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Arista Extensible Operating System (EOS) contains an incomplete comparison with missing factors vulnerability when the switch incorrectly decapsulate and forwards other unexpected tunneled packet with a destination IP matching its configured decapsulation IP.

CSIRTS triage

vendor: Aristaproduct: Extensible Operating SystemOther
What
The vulnerability involves an incomplete comparison that allows the switch to incorrectly handle unexpected tunneled packets.
Who is affected
Deployments of Arista Extensible Operating System that utilize the affected functionality.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Update to the latest version of Arista EOS to mitigate the vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-06-09
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-7473

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-7473coverage & exploitation statusNVD · CVE.org

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