CVE-2026-7473
Confirmed PUBLISHEDArista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding Bypass
4 days faster than CISA KEV
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
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.
- CVE Published
- Jun 05, 2026
- Exploitation Reported
- Jun 05, 2026
- CVSS
- 6.9 Medium
- EPSS
- 0.8%
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| Arista Networks |
EOS
|
4.36.0 |
Affected |
| Arista Networks |
EOS
|
4.35.0 to <= 4.35 |
Affected |
| Arista Networks |
EOS
|
4.34.0 to <= 4.34 |
Affected |
| Arista Networks |
EOS
|
4.33.0 to <= 4.33 |
Affected |
| Arista Networks |
EOS
|
4.32.0 to <= 4.32 |
Affected |
| Arista Networks |
EOS
|
4.31.0 to <= 4.31 |
Affected |
| Arista Networks |
EOS
|
* to <= 4.30 |
Affected |
CVE References
- Vendor Advisory — arista.com arista.com · Vendor Advisory https://www.arista.com/en/support/advisories-notices/security-advisor...
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CVE First | 2026-06-05 16:40 UTC |
| CISA | 2026-06-09 18:01 UTC |
| All CISA Advisories | 2026-06-09 20:20 UTC |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
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
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Exploitation Status
Exploited in the wild
Recorded 2026-06-05 16:40:23 UTC · CVE
Proof of concept available
Recorded 2026-06-10 16:21:10 UTC · GitHub
Weaknesses (CWE)
-
Incomplete Comparison with Missing Factors
Recent Mentions
All CISA Advisories · Jun 09, 2026
CISA has added three new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2026-7473 Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability CVE-2026-11645 Google Chromium V8 Out-of-Bounds Read and Write Vulnerability CVE-2026-20245 Cisco Catalyst SD-WAN Manager Improper Encoding or Escaping of Output Vulnerability These types of vulnerabilities are a frequent attack vector for malicious cyber actors and pose significant risks to the federal enterprise. Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities established the KEV Catalog as a living list of known Common Vulnerabilities and Exposures (CVEs) that carry significant risk to the federal enterprise. BOD 22-01 requires Federal Civilian Executive Branch (FCEB) agencies to remediate identified vulnerabilities by the due date to protect FCEB networks against active threats. See the BOD 22-01 Fact Sheet for more information. Although BOD 22-01 only applies to FCEB agencies, CISA strongly urges all organizations to reduce their exposure to cyberattacks by prioritizing timely remediation of KEV Catalog vulnerabilities as part of their vulnerability management practice. CISA will continue to add vulnerabilities to the catalog that meet the specified criteria.
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
github · Created 2026-06-10 16:21:10 UTC · 0 stars
Vulnerability: On affected Arista EOS platforms with tunnel decapsulation
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
16:21 UTC about 1 month ago16:21 UTC · about 1 month ago
Public PoC available
Public proof-of-concept code published
-
20:20 UTC about 1 month ago20:20 UTC · about 1 month ago
KEV confirmed by All CISA Advisories
Exploitation attested by an external source
-
18:01 UTC about 1 month ago18:01 UTC · about 1 month ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
16:40 UTC about 1 month ago16:40 UTC · about 1 month ago
Added to KEVIntel KEV Feed
High-confidence, third-party attested exploitation
-
16:22 UTC about 1 month ago16:22 UTC · about 1 month ago
CVE published
Vulnerability disclosed publicly
-
20:08 UTC 3 months ago20:08 UTC · 3 months ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2026-7473
{
"cve_id": "CVE-2026-7473",
"title": "Arista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding Bypass",
"affected_vendor": "Arista Networks",
"affected_product": "EOS",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 6.9,
"epss_score": 0.00836,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}