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) identified in the Arista Extensible Operating System (EOS). The flaw occurs when a switch incorrectly decapsulates and forwards unexpected tunneled packets, provided the destination IP of those packets matches the switch’s configured decapsulation IP.
Exposure and applicability
This vulnerability applies to industrial environments utilizing Arista EOS-powered switches for network infrastructure. In OT settings, these switches often facilitate communication between critical assets such as Programmable Logic Controllers (PLCs), Human Machine Interfaces (HMIs), and engineering workstations. The risk is most relevant to configurations where tunneled traffic is utilized and the switch is configured with a decapsulation IP.
Remediation priorities
Our analysis suggests that OT security leaders and network integrators prioritize the following actions based on their specific network topology:
- Inventory and Version Audit: Identify all Arista EOS devices within the industrial control system (ICS) environment to determine if they are running affected versions.
- Vendor Mitigation Application: Apply mitigations as specified in the vendor’s security advisory. This is the primary method for reducing the likelihood of unexpected packet forwarding.
- Configuration Review: Evaluate the necessity of current decapsulation IP configurations and ensure that network segmentation policies account for the possibility of tunneled traffic bypasses.
- Lifecycle Assessment: In cases where mitigations are unavailable or cannot be applied due to operational constraints, evaluate whether the product should be discontinued in favor of a secure alternative.
How to validate remediation
To verify that exposure has been reduced, operators should:
* Confirm through system logs or version checks that the vendor-recommended mitigation or update has been successfully applied.
* Review network configuration files to ensure decapsulation settings are aligned with current security requirements.
* Coordinate with engineering teams to perform a controlled review of traffic flows during a scheduled maintenance window to ensure intended segmentation remains intact.
Limits and open questions
It is currently unknown if this vulnerability has been utilized in ransomware campaigns. Additionally, the specific operational consequences—such as whether this could lead to unauthorized access to restricted OT zones—depend entirely on the individual site’s network architecture and how the Arista switches are integrated into the process control network. Users should note that CISA due dates apply specifically to covered federal agencies and may not reflect the internal compliance timelines of private sector asset owners.
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 03, 2026 at 04:25 UTC.
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