Arista EOS up to 4.36.0 Configuration incomplete comparison with missing factors

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Arista EOS up to 4.36.0. This vulnerability affects unknown code of the component Configuration Handler. Performing a manipulation results in incomplete comparison with missing factors. This vulnerability was named CVE-2026-7473. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Arista EOS up to 4.36.0. It has been classified as problematic. This affects an unknown functionality of the component Configuration Handler. The manipulation with an unknown input leads to a incomplete comparison with missing factors vulnerability. CWE is classifying the issue as CWE-1023. The product performs a comparison between entities that must consider multiple factors or characteristics of each entity, but the comparison does not include one or more of these factors. This is going to have an impact on integrity. The summary by CVE is:

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.

The weakness was presented by Scott Christiansen, Lukas Peitz, Rich Compton and Jonathan Davis. It is possible to read the advisory at arista.com. This vulnerability is uniquely identified as CVE-2026-7473 since 04/29/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/05/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-34858). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• Arista

Name

• EOS

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7
• 4.8
• 4.9
• 4.10
• 4.11
• 4.12
• 4.13
• 4.14
• 4.15
• 4.16
• 4.17
• 4.18
• 4.19
• 4.20
• 4.21
• 4.22
• 4.23
• 4.24
• 4.25
• 4.26
• 4.27
• 4.28
• 4.29
• 4.30
• 4.31
• 4.32
• 4.33
• 4.34
• 4.35
• 4.36.0

License

• commercial

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

Discussion