Arista EOS up to 4.33.8M/4.34.7.1M/4.35.5M/4.36.1F IGMP Snooping Agent input validation

Summaryinfo

A vulnerability was found in Arista EOS up to 4.33.8M/4.34.7.1M/4.35.5M/4.36.1F. It has been classified as critical. This affects an unknown part of the component IGMP Snooping Agent. Performing a manipulation results in input validation. This vulnerability is cataloged as CVE-2026-73462. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as critical has been found in Arista EOS up to 4.33.8M/4.34.7.1M/4.35.5M/4.36.1F. This affects an unknown code block of the component IGMP Snooping Agent. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on availability. The summary by CVE is:

On affected platforms running Arista EOS with IGMP (Internet Group Management Protocol) snooping configured (enabled by default on all VLANs), a network-adjacent unauthenticated attacker can send malformed network packets on an affected VLAN to cause the IGMP snooping agent to terminate unexpectedly. This results in a temporary disruption of multicast traffic management, which may cause multicast traffic to be flooded to all ports of the affected VLAN until the service recovers. Repeated exploitation could result in a prolonged loss of intended multicast forwarding behavior.

The advisory is shared at arista.com. This vulnerability is uniquely identified as CVE-2026-73462 since 08/12/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/16/2026).

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

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Arista

Name

• EOS

Version

• 4.33.8M
• 4.34.7.1M
• 4.35.5M
• 4.36.1F

License

• commercial

CPE 2.3info

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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