MSRXCVE-2026-7473
CVE-2026-7473
Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CVSS 4.0 · CNA · arista.com
chance of exploitation in the next 30 days (EPSS; higher than 65% of CVEs)
On affected platforms running Arista EOS where a tunnel decapsulation configuration—such as VXLAN (Virtual Extensible LAN), decap-groups, or a GRE (Generic Routing Encapsulation) tunnel interface—is present, the switch will incorrectly decapsulate and forward other unexpected tunneled packet with a destination IP matching its configured decapsulation IP. This occurs because the switch does not verify the tunnel protocol type, potentially leading to the unexpected processing of non-configured tunnel traffic. This issue has been reported as being exploited in the wild.
Scores
Affected products
- arista eos: all versions
Weakness: CWE-1023
3 references (advisories, patches, write-ups)
- https://www.arista.com/en/support/advisories-notices/security-advisory/22872-security-advisory-0137 · Broken Link
- https://www.arista.com/en/support/advisories-notices/security-advisory/24005-security-advisory-0137 · Mitigation, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-7473 · US Government Resource
Sources: NVD, CVE.org, FIRST EPSS. Missing ones did not answer or have no record yet.