CVE-2026-7473

Description

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.

CVSS Metrics

• v4.0•MEDIUM•Score: 6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
• v4.0•MEDIUM•Score: 6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
• v3.1•MEDIUM•Score: 5.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

EPSS Trends

Current EPSS score: 0.03%• Percentile: 9%

Techniques & Countermeasures

• CWE-1023•Incomplete Comparison with Missing Factors

  The product performs a comparison between entities that must consider multiple factors or characteristics of each entity, but the comparison does not include one or more of these factors.

Affected Systems

• arista networks•eos

  4.36.0 | ≥ 4.35.0, ≤ 4.35 | ≥ 4.34.0, ≤ 4.34 | ≥ 4.33.0, ≤ 4.33 | ≥ 4.32.0, ≤ 4.32 | ≥ 4.31.0, ≤ 4.31 | ≤ 4.30

References (3)

• https://www.arista.com/en/support/advisories-notices/security-advisory/22872-security-advisory-0137
• https://www.arista.com/en/support/advisories-notices/security-advisory/24005-security-advisory-0137
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-7473