Arista EOS up to 4.36.0.1F gRPC Network Security Interface input validation

Summaryinfo

A vulnerability was found in Arista EOS up to 4.36.0.1F. It has been rated as problematic. The affected element is an unknown function of the component gRPC Network Security Interface. The manipulation leads to input validation. This vulnerability is uniquely identified as CVE-2026-73445. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Arista EOS up to 4.36.0.1F. This issue affects an unknown function of the component gRPC Network Security Interface. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity. The summary by CVE is:

On affected platforms running Arista EOS, an issue with the gRPC Network Security Interface (gNSI) Authz Rotate RPC may cause an incorrect Authz policy which was uploaded in the ongoing RPC stream to become active. This does not affect Bootz. This issue was discovered internally by Arista and the company is not aware of any malicious uses of this issue in customer networks.

It is possible to read the advisory at arista.com. The identification of this vulnerability is CVE-2026-73445 since 08/12/2026. The exploitation is known to be easy. The attack may be initiated remotely. Additional levels of successful authentication are required for exploitation. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 4.32.0F or 4.33.0F 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
• 4.33.8M
• 4.34.7M
• 4.35.5M
• 4.36.0.1F

License

• commercial

CPE 2.3info

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• 🔒
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CPE 2.2info

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• 🔒
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