01 Record
CVE-2026-7473
Arista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding Bypass
MediumKEVPUBLISHEDCNA: Arista
CNA base score6.9 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
02 Description
Arista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding Bypass
03 Exploitation and scoring
- Exploitation
- Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2026-06-09. Federal remediation due 2026-06-23.
- SSVC decision
- ExploitationactiveCISA reports credible evidence of active exploitation.
- AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
- Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
- EPSS probability
- 1.10% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 65.6% of scored records. A rank, not a probability.
- NVD base score
- 6.9 (CVSS v4.0), scored by the NVD independently of the CNA.
- NVD CVSS vector
- 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/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
- NVD analysis status
- Analyzed. NVD last modified this record on 2026-10-25.
- Red Hat severity
- No Red Hat rating. Red Hat rates the CVEs that affect its products.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-06-05 16:22Z4 MO AGO
- Last updated
- 2026-10-07 18:27Z21 DAYS AGO
- Reserved
- 2026-04-29
- Assigning CNA
- Arista
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 6.9)
- CNA CVSS vector
- 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
- Weaknesses
- CWE-1023Incomplete Comparison with Missing FactorsClass
- Data version
- 5.2
- Document digest
- bda40bd4695b0e910a3532dffe14f9d80edbbc28e48bd2ca8de0820c9c2ce23f
05 Affected products
VendorProductVersionsPlatforms
Arista NetworksEOS4.36.0, 4.35.0 to 4.35, 4.34.0 to 4.34, 4.33.0 to 4.33, 4.32.0 to 4.32, 4.31.0 to 4.31, * to 4.307020R Series, 7280R/R2 Series, 7500R/R2 Series, 7280R3 Series (Limited exposure: IP-in-IPv6 and GUEv6), 7500R3 Series (Limited exposure: IP-in-IPv6 and GUEv6), 7800R3 Series (Limited exposure: IP-in-IPv6 and GUEv6)
06 References
- www.arista.comhttps://www.arista.com/en/support/advisories-notices/security-advisory/22872-security-advisory-0137
- www.arista.comhttps://www.arista.com/en/support/advisories-notices/security-advisory/24005-security-advisory-0137
- www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-7473
07 Remediation
No software upgrade path is planned to address this issue due to the risk of breaking existing configuration on deployments. The recommended resolution of this issue is to follow the appropriate mitigation instructions detailed in the workaround block.