No Patch Planned for Exploited Arista EOS Vulnerability
A vulnerability (CVE-2026-7473) in Arista EOS allows certain tunnel endpoint configurations to incorrectly process non-configured tunnel traffic. This flaw affects multiple Arista switch series and is actively exploited in the wild. Arista has stated no patch or software upgrade will be provided due to risks of breaking existing configurations. Instead, organizations are advised to apply vendor-supplied mitigations or discontinue use of vulnerable devices. The US CISA has added this vulnerability to its Known Exploited Vulnerabilities list, urging remediation within two weeks.
AI Analysis
Technical Summary
CVE-2026-7473 is a vulnerability in Arista Extensible Operating System (EOS) where the tunnel protocol type is not properly verified in certain configurations. Devices configured as tunnel endpoints with decapsulation IPs (e.g., decap-groups, GRE tunnel interfaces, VXLAN) may incorrectly accept and decapsulate tunnel protocols not explicitly configured. This affects Arista 7020R, 7280R/R2, 7500R/R2 series, and certain IPv6 decap group scenarios on 7280R3, 7500R3, and 7800R3 series. The vulnerability has a CVSS score of 6.9 and is exploited in the wild. Arista has confirmed no patch or hotfix will be released due to the risk of breaking existing deployments and recommends applying mitigations or discontinuing vulnerable devices. CISA has added this to its KEV list with a two-week remediation directive for federal agencies.
Potential Impact
The vulnerability allows an attacker to send tunnel traffic of unconfigured types to a device configured as a tunnel endpoint, potentially leading to unauthorized processing of such traffic. This could affect network traffic handling and security on affected Arista EOS devices. The flaw is actively exploited in the wild, increasing risk to organizations using vulnerable devices. No patch is available, which prolongs exposure unless mitigations are applied or devices are replaced.
Mitigation Recommendations
No patch or software upgrade is planned for this vulnerability. Organizations must follow Arista's detailed mitigation instructions as provided in the vendor advisory. If mitigation is not feasible, discontinuing use of the vulnerable devices is recommended. Federal agencies are urged by CISA to address this vulnerability within two weeks. Check the vendor advisory for the exact mitigation steps and apply them promptly.
No Patch Planned for Exploited Arista EOS Vulnerability
Description
A vulnerability (CVE-2026-7473) in Arista EOS allows certain tunnel endpoint configurations to incorrectly process non-configured tunnel traffic. This flaw affects multiple Arista switch series and is actively exploited in the wild. Arista has stated no patch or software upgrade will be provided due to risks of breaking existing configurations. Instead, organizations are advised to apply vendor-supplied mitigations or discontinue use of vulnerable devices. The US CISA has added this vulnerability to its Known Exploited Vulnerabilities list, urging remediation within two weeks.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-7473 is a vulnerability in Arista Extensible Operating System (EOS) where the tunnel protocol type is not properly verified in certain configurations. Devices configured as tunnel endpoints with decapsulation IPs (e.g., decap-groups, GRE tunnel interfaces, VXLAN) may incorrectly accept and decapsulate tunnel protocols not explicitly configured. This affects Arista 7020R, 7280R/R2, 7500R/R2 series, and certain IPv6 decap group scenarios on 7280R3, 7500R3, and 7800R3 series. The vulnerability has a CVSS score of 6.9 and is exploited in the wild. Arista has confirmed no patch or hotfix will be released due to the risk of breaking existing deployments and recommends applying mitigations or discontinuing vulnerable devices. CISA has added this to its KEV list with a two-week remediation directive for federal agencies.
Potential Impact
The vulnerability allows an attacker to send tunnel traffic of unconfigured types to a device configured as a tunnel endpoint, potentially leading to unauthorized processing of such traffic. This could affect network traffic handling and security on affected Arista EOS devices. The flaw is actively exploited in the wild, increasing risk to organizations using vulnerable devices. No patch is available, which prolongs exposure unless mitigations are applied or devices are replaced.
Mitigation Recommendations
No patch or software upgrade is planned for this vulnerability. Organizations must follow Arista's detailed mitigation instructions as provided in the vendor advisory. If mitigation is not feasible, discontinuing use of the vulnerable devices is recommended. Federal agencies are urged by CISA to address this vulnerability within two weeks. Check the vendor advisory for the exact mitigation steps and apply them promptly.
Technical Details
- Article Source
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Threat ID: 6a2906f38dd33fbd85fa840c
Added to database: 6/10/2026, 6:40:51 AM
Last enriched: 6/10/2026, 6:40:58 AM
Last updated: 6/10/2026, 2:19:31 PM
Views: 7
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