CVE-2026-73445: CWE-20 Improper Input Validation in Arista Networks EOS
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.
AI Analysis
Technical Summary
This vulnerability in Arista EOS arises from improper input validation (CWE-20) in the gNSI Authz Rotate RPC. Specifically, an incorrect authorization policy that is uploaded during an ongoing RPC stream may become active erroneously. The issue affects multiple versions of EOS from 4.31.0F through 4.36.0.1F, with some version ranges inclusive and others exclusive as specified. The vulnerability does not impact the Bootz component. Arista discovered this issue internally and has not reported any malicious exploitation to date.
Potential Impact
The vulnerability can lead to an incorrect authorization policy being activated, which may impact the integrity of authorization controls within the affected EOS platforms. The CVSS v3.1 score is 4.9 (medium severity), indicating a moderate impact primarily on authorization integrity without confidentiality or availability impact. No known active exploitation has been reported.
Mitigation Recommendations
No vendor advisory or patch information is provided in the input data. Patch status is not yet confirmed — check the official Arista Networks advisory for current remediation guidance. Since this is an internal discovery with no known exploitation, monitor vendor communications for patches or updates. Avoid relying on the affected versions listed until a fix is confirmed.
CVE-2026-73445: CWE-20 Improper Input Validation in Arista Networks EOS
Description
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.
CVSS v3.1
Score 4.9medium
Affected software
Arista Networks
EOS
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Arista EOS arises from improper input validation (CWE-20) in the gNSI Authz Rotate RPC. Specifically, an incorrect authorization policy that is uploaded during an ongoing RPC stream may become active erroneously. The issue affects multiple versions of EOS from 4.31.0F through 4.36.0.1F, with some version ranges inclusive and others exclusive as specified. The vulnerability does not impact the Bootz component. Arista discovered this issue internally and has not reported any malicious exploitation to date.
Potential Impact
The vulnerability can lead to an incorrect authorization policy being activated, which may impact the integrity of authorization controls within the affected EOS platforms. The CVSS v3.1 score is 4.9 (medium severity), indicating a moderate impact primarily on authorization integrity without confidentiality or availability impact. No known active exploitation has been reported.
Mitigation Recommendations
No vendor advisory or patch information is provided in the input data. Patch status is not yet confirmed — check the official Arista Networks advisory for current remediation guidance. Since this is an internal discovery with no known exploitation, monitor vendor communications for patches or updates. Avoid relying on the affected versions listed until a fix is confirmed.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Arista
- Date Reserved
- 2026-08-12T16:42:47.920Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aaa5e9855bf5e2cf5486ffc
Added to database: 09/16/2026, 09:17:12 UTC
Last enriched: 09/16/2026, 09:31:46 UTC
Last updated: 09/16/2026, 23:25:58 UTC
Views: 10
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