CVE-2026-73461

Security Advisory 0163

Published Sep 16, 2026 CVSS 4.0 · 9.4 Critical EPSS < 1% KEV · Not listed
Description
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.

Remediation

Vendor Solution

The following EOS releases contain the fix for this vulnerability: - 4.33.9M and later releases in the 4.33.x train - 4.34.8M and later releases in the 4.34.x train - 4.35.6M and later releases in the 4.35.x train - 4.36.1F and later releases in the 4.36.x train No hotfix is available for this vulnerability.


Vendor Workaround

Ensure that the privilege level 0 AAA authorization method list includes methods beyond 'none' to prevent unintended access escalation: aaa authorization exec default local group tacacs+ aaa authorization commands 0 default local group tacacs+ To detect potential exploitation, enable AAA accounting and monitor logs for cases where a user's privilege level in gRPC requests does not match their defined privilege level (e.g., a user with privilege 9 appearing as priv-lvl=0 in gRPC requests).

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Arista
Arista eos
Vendors & Products Arista
Arista eos
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title Security Advisory 0163
Weaknesses CWE-266
References
Metrics cvssV3_1

{'score': 8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.4, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Arista
Published
Updated
Sep 17, 2026, 3:56 AM
Reserved
Aug 12, 2026, 4:45 PM
Status
Awaiting Analysis
Published
Sep 16, 2026, 9:17 AM
Modified
Sep 17, 2026, 4:18 AM