Out-of-Bounds Write Vulnerability in Cisco NX-OS Software
CVE-2026-76459

8.8HIGH

Key Information:

Vendor

Cisco
Status
Cisco Nx-os Software
Cisco Nx-os System Software In Aci Mode
Cisco Unified Computing System (managed)
Vendor
CVE Published:
7 October 2026

Badges

👾 Exploit Exists

What is CVE-2026-76459?

Cisco's NX-OS software is affected by vulnerabilities related to out-of-bounds write issues, known to allow attackers to manipulate memory beyond allocated boundaries, potentially leading to unauthorized access or system instability. This vulnerability arose as a result of Cisco's proactive security measures, highlighting the importance of software hardening in mitigating potential risks. The issue falls under the Common Weakness Enumeration category CWE-787, indicating a significant concern for system integrity and security.

Affected Version(s)

Cisco NX-OS Software 8.2(5)

Cisco NX-OS Software 7.3(5)D1(1)

Cisco NX-OS Software 8.4(2)

References

https://sec.cloudapps.cisco.com/security/center/content/C...

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.