CVE-2026-76457: Out-of-bounds Read in Cisco Cisco NX-OS Software
Description
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco NX-OS engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-76457 are related to out-of-bounds read issues that are grouped under the Common Weakness Enumeration (CWE) CWE-125.
CVSS v3.1
Score 8.6high
Affected software
Cisco
Cisco NX-OS Software
Cisco
Cisco NX-OS System Software in ACI Mode
Cisco
Cisco Unified Computing System (Managed)
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Cisco NX-OS Software contains multiple out-of-bounds read vulnerabilities grouped under CWE-125, identified during an internal security review by Cisco's engineering team. These issues can lead to high impact on system availability. The CVSS 3.1 base score is 8.6, reflecting network attack vector, low attack complexity, no privileges or user interaction required, and scope change with availability impact only. No detailed technical exploitation or affected version information is provided.
Potential Impact
The vulnerability can cause a high impact on the availability of affected Cisco NX-OS systems, potentially leading to denial of service conditions. There is no impact on confidentiality or integrity according to the CVSS vector. No known exploits in the wild have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Cisco has released a software hardening update addressing multiple vulnerabilities including this one, but no explicit patch or fixed versions are provided in the available data. Users should monitor Cisco advisories for official fixes and apply updates when available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- cisco
- Date Reserved
- 2026-08-19T12:02:03.637Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac674882cdf04f65664732b
Added to database: 10/07/2026, 16:34:16 UTC
Last enriched: 10/07/2026, 16:51:29 UTC
Last updated: 10/07/2026, 18:56:10 UTC
Views: 9
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.