Historical catalog analysis: CISA added this entry on June 09, 2026. The entry reflects catalog information retrieved on August 31, 2026, not a snapshot archived on the inclusion date. Check current vendor guidance before acting.
What the vulnerability is
CVE-2026-7473 is an incomplete comparison with missing factors vulnerability (CWE-1023) affecting Arista Extensible Operating System (EOS). The flaw occurs when a switch incorrectly decapsulates and forwards unexpected tunneled packets. This behavior is triggered if the destination IP of the packet matches the configured decapsulation IP of the device.
Exposure and applicability
This vulnerability applies to infrastructure owners utilizing Arista EOS on their network switches. The exposure path involves the processing of tunneled traffic; specifically, assets are susceptible if they are configured with a decapsulation IP that can be targeted by unexpected tunneled packets. Organizations managing cloud services should also consider applicable BOD 22-01 guidance in the context of this vulnerability.
Remediation priorities
Based on our analysis, vulnerability management teams should prioritize the following actions to reduce exposure:
- Identify Affected Assets: Inventory all Arista EOS deployments and identify those with active decapsulation configurations. This is a prerequisite for determining which devices require immediate mitigation.
- Apply Vendor Mitigations: Implement the corrective actions specified in the vendor’s security advisory. For environments where mitigations cannot be applied, our analysis suggests evaluating whether to discontinue use of the affected product features or devices.
- Review Tunneling Architecture: Evaluate the trust boundaries of tunneled traffic entering the network to determine if compensating controls can limit the delivery of unexpected packets to the decapsulation IP.
How to validate remediation
To verify that exposure has been reduced, defenders should move beyond simple version checks. Validation should include:
* Configuration Audit: Confirming that vendor-recommended mitigation settings are active and correctly applied across all identified assets.
* Functional Verification: Following the specific validation steps provided by Arista to ensure the system no longer incorrectly decapsulates unexpected packets.
Verification is only complete when the result of the mitigation—the prevention of incorrect packet forwarding—is confirmed, rather than just the presence of a patch.
Limits and open questions
It remains unknown whether this vulnerability has been utilized in known ransomware campaigns. Additionally, while CISA has established a remediation deadline for federal agencies, this date does not automatically apply to private sector organizations. There is residual risk if mitigations are applied inconsistently across a distributed infrastructure or if the vendor’s provided fixes do not cover all possible tunneled packet variations.
Source and editorial note
CVE-2026-7473: Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability · Source date: June 09, 2026 · Retrieved August 31, 2026.
Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.
Archive date: June 12, 2026. The displayed post date is assigned three days after the source date to organize this retrospective archive; it does not mean this site published the analysis then. First published by this site: September 08, 2026 at 02:48 UTC.
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