--- title: "CVE-2026-7473: Arista EOS Unexpected Tunnel Protocol… | CubePath" description: "On affected platforms running Arista EOS where a tunnel decapsulation configuration—such as VXLAN (Virtual Extensible LAN), decap-groups, or a GRE…" language: en source: https://cubepath.com/security/cve/CVE-2026-7473 --- # CVE-2026-7473: Arista EOS Unexpected Tunnel Protocol… | CubePath ## 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. Official description from the CVE record, published by Arista. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-7473) ## Key data ### CVSS 4.0 Medium 6.9 Score published by Arista in the CVE record. 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 | Metric | Value | What it means | | ----------------------------------- | ------- | --------------------------------------------------------------------------------------------------------------- | | Attack vector | Network | The vulnerable component can be reached over a network, possibly from the Internet. | | Attack complexity | Low | No measurable action is needed to get around the system's built-in security controls. The attack is repeatable. | | Attack requirements | None | The attack works without any special deployment or execution conditions. | | Privileges required | None | No account or privileges are needed. | | User interaction | None | No action from any user is needed. | | Vulnerable system: confidentiality | None | No effect on the secrecy of data. | | Vulnerable system: integrity | Low | Limited effect on the trustworthiness of data. | | Vulnerable system: availability | None | No effect on availability. | | Subsequent systems: confidentiality | None | No effect on other systems' data secrecy. | | Subsequent systems: integrity | Low | Limited effect on other systems' data trustworthiness. | | Subsequent systems: availability | None | No effect on other systems' availability. | ### CVSS 3.1 Medium 5.8 Score published by Arista in the CVE record. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N | Metric | Value | What it means | | ---------------------- | ------- | ----------------------------------------------------------------------------------- | | Attack vector | Network | The vulnerable component can be reached over a network, possibly from the Internet. | | Attack complexity | Low | No special conditions are needed. The attack can be repeated at will. | | Privileges required | None | No account or privileges are needed. | | User interaction | None | No action from any user is needed. | | Scope | Changed | The impact can reach other components beyond the vulnerable one. | | Confidentiality impact | None | No effect on the secrecy of data. | | Integrity impact | Low | Limited effect on the trustworthiness of data. | | Availability impact | None | No effect on availability. | CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) . ### EPSS Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days. Score 0.01108 (1.1% probability) Percentile 66.1% Scores of Nov 10, 2026 Model v2026.06.15 ### CISA Known Exploited Vulnerabilities This CVE is listed in the CISA KEV catalog. Name in the catalog Arista Extensible Operating System Incomplete Comparison with Missing Factors Vulnerability Added to the catalog Jun 9, 2026 Federal due date Jun 23, 2026 ### CISA assessment as of Jun 10, 2026 Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA. Exploitation Recorded by CISA as active Automatable yes Technical impact total ### Weakness (CWE) CWE catalog version 5.0. CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license. - [CWE-1023](https://cwe.mitre.org/data/definitions/1023.html) Incomplete Comparison with Missing Factors ## Affected products Products listed in the CVE record, as the CNA published them. - Arista Networks EOS - affected: 4.36.0 - affected: 4.35.0 up to 4.35 - affected: 4.34.0 up to 4.34 - affected: 4.33.0 up to 4.33 - affected: 4.32.0 up to 4.32 - affected: 4.31.0 up to 4.31 - affected: \* up to 4.30 ## References Links listed in the CVE record. They lead to other sites, which CubePath does not control. - [arista.com/en/support/advisories-notices/security-advisory/…](https://www.arista.com/en/support/advisories-notices/security-advisory/22872-security-advisory-0137) vendor-advisory ## Timeline 1. ID reserved Apr 29, 2026 2. Record published Jun 5, 2026 3. Added to CISA KEV Jun 9, 2026 4. Record last updated Oct 7, 2026 ## Look up another CVE ## About CubePath CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection. [Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection) Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:11 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)