Vulnerability details
CVE-2026-7473
Actively exploited
Arista Networks EOS
Arista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding Bypass
CVSS 4.0
6.9Medium
Official 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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 6.9Medium | 4.0 | CVEProject cvelistV5 (CNA) (Arista) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N |
| 5.8Medium | 3.1 | CVEProject cvelistV5 (CNA) (Arista) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Arista Networks | EOS | v ≤ 4.30 | CVEProject cvelistV5 (CNA) |
| Arista Networks | EOS | 4.36.0 | CVEProject cvelistV5 (CNA) |
| Arista Networks | EOS | 4.31.0 ≤ v ≤ 4.31 | CVEProject cvelistV5 (CNA) |
| Arista Networks | EOS | 4.32.0 ≤ v ≤ 4.32 | CVEProject cvelistV5 (CNA) |
| Arista Networks | EOS | 4.33.0 ≤ v ≤ 4.33 | CVEProject cvelistV5 (CNA) |
| Arista Networks | EOS | 4.34.0 ≤ v ≤ 4.34 | CVEProject cvelistV5 (CNA) |
| Arista Networks | EOS | 4.35.0 ≤ v ≤ 4.35 | CVEProject cvelistV5 (CNA) |
References and advisories
3- https://www.arista.com/en/support/advisories-notices/security-advisory/22872-security-advisory-0137 vendor-advisory
- https://www.arista.com/en/support/advisories-notices/security-advisory/24005-security-advisory-0137 vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-7473 government-resource
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Details
- Published
- 2026-06-05
- Last updated
- 2026-10-07
- State
- Published
- Assigner (CNA)
- Arista
- Kolun priority
- 67 · High
CISA KEV catalog
- Date added
- 2026-06-09
- Due date
- 2026-06-23
- Used in ransomware
- Unknown
Exploit prediction (EPSS)
1.1%
Probability of exploitation in 30 days
66.1%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Active
- Technical impact
- Total
Weaknesses (CWE)
- CWE-1023Incomplete Comparison with Missing Factors