CVE-2026-73445Network attack vector

Authz policy corruption via multiple Rotate uploads

Published Sep 16, 2026 · Updated Sep 16, 2026

Improper input validation in Arista EOS 4.31.x through 4.36.0.1F allows remote authenticated users to activate an unintended Authz policy. The gNSI Authz Rotate handler restores a backup after multiple UploadRequests in one RPC stream, activating a policy other than the most recently finalized policy. Exploitation requires an enabled OpenConfig gRPC transport with gNSI Authz and high privileges; Bootz is unaffected.

CVSS severity4.9
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Arista EOS 4.31.x through 4.36.0.1F allows remote authenticated users to activate an unintended Authz policy. The gNSI Authz Rotate handler restores a backup after multiple UploadRequests in one RPC stream, activating a policy other than the most recently finalized policy. Exploitation requires an enabled OpenConfig gRPC transport with gNSI Authz and high privileges; Bootz is unaffected.

The record

CVE
CVE-2026-73445
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
Arista Networks
Product
Arista EOS
Classifications
CWE-20
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.31.0F <4.32.0F
  2. Affected versionversion=4.32.0F <4.33.0F
  3. Affected versionversion=4.33.0F <=4.33.8M
  4. Affected versionversion=4.34.0F <=4.34.7M
  5. Affected versionversion=4.35.0F <=4.35.5M
  6. Affected versionversion=4.36.0F <=4.36.0.1F

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Arista Networks · Arista EOSversion=4.31.0F <4.32.0F; version=4.32.0F <4.33.0F; version=4.33.0F <=4.33.8M; version=4.34.0F <=4.34.7M; version=4.35.0F <=4.35.5M; version=4.36.0F <=4.36.0.1F

Published CVSS scores

6.9Arista NetworksCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
4.9Arista NetworksCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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