CVE-2026-19640: CWE-863 Incorrect Authorization in Arista Networks EOS
On affected platforms running Arista EOS, an authenticated user with access to the gNMI (gRPC Network Management Interface) may receive incorrect authorization results, potentially allowing access beyond their currently assigned permissions. 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
On affected Arista EOS platforms, an authenticated user accessing the gNMI (gRPC Network Management Interface) may experience incorrect authorization checks. This flaw could allow the user to gain access beyond their assigned permissions. The vulnerability corresponds to CWE-863 (Incorrect Authorization). It affects multiple EOS versions from 4.24.0F up to and including 4.36.0.1F in various sub-versions. Arista discovered this issue internally and is not aware of any active exploitation in the wild.
Potential Impact
The vulnerability may allow an authenticated user with gNMI access to perform unauthorized actions or access resources beyond their assigned permissions, potentially leading to limited confidentiality and integrity impacts. There is no indication of availability impact. No known exploitation has been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or patch links are provided, users should monitor Arista's advisories for updates. Until a fix is available, restrict gNMI access to trusted users only and apply the principle of least privilege.
CVE-2026-19640: CWE-863 Incorrect Authorization in Arista Networks EOS
Description
On affected platforms running Arista EOS, an authenticated user with access to the gNMI (gRPC Network Management Interface) may receive incorrect authorization results, potentially allowing access beyond their currently assigned permissions. 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 4.2medium
Affected software
Arista Networks
EOS
pkg:rpm/arista/eosRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
On affected Arista EOS platforms, an authenticated user accessing the gNMI (gRPC Network Management Interface) may experience incorrect authorization checks. This flaw could allow the user to gain access beyond their assigned permissions. The vulnerability corresponds to CWE-863 (Incorrect Authorization). It affects multiple EOS versions from 4.24.0F up to and including 4.36.0.1F in various sub-versions. Arista discovered this issue internally and is not aware of any active exploitation in the wild.
Potential Impact
The vulnerability may allow an authenticated user with gNMI access to perform unauthorized actions or access resources beyond their assigned permissions, potentially leading to limited confidentiality and integrity impacts. There is no indication of availability impact. No known exploitation has been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or patch links are provided, users should monitor Arista's advisories for updates. Until a fix is available, restrict gNMI access to trusted users only and apply the principle of least privilege.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Arista
- Date Reserved
- 2026-08-12T16:48:12.259Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aaa621555bf5e2cf54c8ccf
Added to database: 09/16/2026, 09:32:05 UTC
Last enriched: 09/16/2026, 09:47:18 UTC
Last updated: 09/17/2026, 03:22:35 UTC
Views: 13
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.