CVE-2026-19641: CWE-116 Improper Encoding or Escaping in Arista Networks EOS
On affected platforms running Arista EOS with password authentication configured, a specially crafted password can create orphan authentication sessions. Repeated exploitation of this issue can exhaust available authentication resources, resulting in legitimate users being unable to log in to the device. This issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.
AI Analysis
Technical Summary
This vulnerability in Arista EOS occurs when password authentication is configured. A specially crafted password can trigger the creation of orphan authentication sessions. These orphan sessions consume authentication resources, and repeated exploitation can lead to resource exhaustion, causing denial of service by blocking legitimate user logins. The issue was discovered internally by Arista Networks, and no active exploitation in customer environments is known.
Potential Impact
The impact is a denial of service condition affecting authentication on Arista EOS devices. Legitimate users may be unable to log in due to exhaustion of authentication resources caused by orphaned sessions. There is no confidentiality or integrity impact reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, monitor authentication resource usage and consider limiting exposure of affected devices to untrusted networks.
CVE-2026-19641: CWE-116 Improper Encoding or Escaping in Arista Networks EOS
Description
On affected platforms running Arista EOS with password authentication configured, a specially crafted password can create orphan authentication sessions. Repeated exploitation of this issue can exhaust available authentication resources, resulting in legitimate users being unable to log in to the device. This issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.
CVSS v3.1
Score 5.3medium
Affected software
Arista Networks
EOS
pkg:github/arista-networks/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
This vulnerability in Arista EOS occurs when password authentication is configured. A specially crafted password can trigger the creation of orphan authentication sessions. These orphan sessions consume authentication resources, and repeated exploitation can lead to resource exhaustion, causing denial of service by blocking legitimate user logins. The issue was discovered internally by Arista Networks, and no active exploitation in customer environments is known.
Potential Impact
The impact is a denial of service condition affecting authentication on Arista EOS devices. Legitimate users may be unable to log in due to exhaustion of authentication resources caused by orphaned sessions. There is no confidentiality or integrity impact reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, monitor authentication resource usage and consider limiting exposure of affected devices to untrusted networks.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Arista
- Date Reserved
- 2026-08-12T16:48:22.864Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aa98f2d55bf5e2cf53845cb
Added to database: 09/15/2026, 18:32:13 UTC
Last enriched: 09/15/2026, 18:47:08 UTC
Last updated: 09/16/2026, 03:07:51 UTC
Views: 3
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.