CVEs / CVE-2026-7473
CVE-2026-7473: Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability
- Known exploited in the CISA KEV catalog since 9 Jun 2026
- medium 6.9 CVSS 4.0 (from the CNA)
- EPSS 1.1% chance of exploitation in the next 30 days, higher than 65% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
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.
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.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| Arista Networks EOS | 4.36.0 | — |
| Arista Networks EOS | from 4.35.0, up to and including 4.35 | — |
| Arista Networks EOS | from 4.34.0, up to and including 4.34 | — |
| Arista Networks EOS | from 4.33.0, up to and including 4.33 | — |
| Arista Networks EOS | from 4.32.0, up to and including 4.32 | — |
| Arista Networks EOS | from 4.31.0, up to and including 4.31 | — |
| Arista Networks EOS | up to and including 4.30 | — |
Exploitation
| In CISA KEV since | 9 Jun 2026 |
|---|---|
| Due date for US federal agencies | 23 Jun 2026 |
| Used in ransomware campaigns | Unknown |
| Required action | Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. |
Severity
| CVSS 4.0 | 6.9 mediumCVSS: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:XScored by the CNA ([email protected]) |
|---|---|
| Weakness | CWE-1023 |
References
- CVE-2026-7473 on NVD
- CVE-2026-7473 in the CISA KEV catalog
- https://www.arista.com/en/support/advisories-notices/security-advisory/24005-security-advisory-0137 (cited by CISA)
- 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
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.