Medium severity · published Jun 5, 2026
CVE-2026-7473
Arista EOS Unexpected Tunnel Protocol Decapsulation and Forwarding Bypass
In wildKEV
5.8
CVSS
1.1%
EPSS
Yes
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 66% of CVEs
Exploited in the wildYes
CISA KEVListed Jun 9, 2026
Federal remediation dueJun 23, 2026
Ransomware campaign useNot known
Affected products
Which versions
EO
EOS · Arista Networks
4.36.0; 4.35.0 through 4.35; 4.34.0 through 4.34; 4.33.0 through 4.33; 4.32.0 through 4.32; 4.31.0 through 4.31; +1 more · source: vendor, NVD
EO
Extensible Operating System · Arista
All versions, or not specified · source: KEV
In the news
VulnerabilityCritical
CISA Adds Three Known Exploited Vulnerabilities to Catalog
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 .
Jun 9, 2026·CISA Advisories
VulnerabilityHigh
[CISA KEV] CVE-2026-7473: Arista Extensible Operating System - Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability
Arista Extensible Operating System (EOS) contains an incomplete comparison with missing factors vulnerability when the switch incorrectly decapsulate and forwards other unexpected tunneled packet with a destination IP matching its configured decapsulation IP.
EOExtensible Operating SystemCVE-2026-7473
Jun 9, 2026·CISA KEV
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-7473
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-7473
CISA KEV catalogue
https://www.cisa.gov/known-exploited-vulnerabilities-catalog
vendor-advisory
https://www.arista.com/en/support/advisories-notices/security-advisory/22872-security-advisory-0137
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On affected platforms running Arista EOS with OpenConfig configured, a gNMI Set request can be run when it should have been rejected (SSL Profiles Enabled).
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