02 Records
FEED: ACQUIRING
01 RecordSTATE: PUBLISHED
02 Description
CNA: AristaArista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding Bypass
03 Exploitation and scoring
SRC: CISA, FIRST, NVD, RED HAT- 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.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.- EPSS probability
- 1.11% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Ranks above 63.5% 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 2026-06-17.
- 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.
SCHEMA: 5.2
- Published
- 2026-06-05 16:22Z3 MO AGO
- Last updated
- 2026-06-10 03:57Z2 MO 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
- fedd5f7993459aa414a0cdbe8b2297f90e93aa816e516c47317ec427dcbf3918
05 Affected products
PAIRS: 1VendorProductVersionsPlatforms
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) SRC: CNA
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.