Arista EOS up to 4.36.0.1F AAA improper authorization

Summaryinfo

A vulnerability labeled as very critical has been found in Arista EOS up to 4.36.0.1F. Affected by this vulnerability is an unknown functionality of the component AAA. Such manipulation leads to improper authorization. This vulnerability is listed as CVE-2026-73461. The attack may be performed from remote. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Arista EOS up to 4.36.0.1F. It has been rated as very critical. Affected by this issue is an unknown part of the component AAA. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. CVE summarizes:

On affected EOS platforms with AAA-based gRPC authorization enabled for OpenConfig, gRPC requests of an authenticated user to OpenConfig may use the wrong privilege level, resulting in an authorization using the wrong AAA method list. This does not impact non-gRPC OpenConfig requests such as NETCONF.

The advisory is shared for download at arista.com. This vulnerability is handled as CVE-2026-73461 since 08/12/2026. The exploitation is known to be easy. The attack may be launched remotely. Additional levels of successful authentication are necessary for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/16/2026). The MITRE ATT&CK project declares the attack technique as T1548.002.

Upgrading to version 4.30.0F, 4.31.0F or 4.32.0F eliminates this vulnerability.

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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
• 4.32.11M
• 4.33.8M
• 4.34.7M
• 4.35.5M
• 4.36.0.1F

License

• commercial

CPE 2.3info

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CPE 2.2info

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