Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability
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…
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 3 / 5
- KEV catalog (CISA)09 Jun 2026
- Exploited in EUVD (ENISA)09 Jun 2026
- Used by ransomwareno
- EPSS above 10 %1.1%
- No account, over the networkyes
What to do
Fix
Apply the vendor’s fix as soon as it is available.
CISA guidance: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Description ENISA EUVD
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 products
- * ≤4.30
- 4.36.0
- 4.34.0 ≤4.34
- 4.31.0 ≤4.31
- 4.32.0 ≤4.32
- 4.33.0 ≤4.33
- 4.35.0 ≤4.35
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
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Published
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Exploitation reported (ENISA)
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Added to the KEV catalog
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CISA remediation due date
References
Other exploited vulnerabilities from the same vendor
- CVE-2026-114625Arista VeloCloud Orchestrator SQL Injection Vulnerability5.0 · Rising fast
- CVE-2026-93952Arista VeloCloud Orchestrator Improper Input Validation Vulnerability5.6 · Actively exploited
- CVE-2026-16812Arista VeloCloud Orchestrator On-Prem OS Command Injection Vulnerability5.9 · Actively exploited