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9.8

Cisco NX‑OS switches can be taken over via crafted packets

CVE-2026-76501 · published 2 days ago
Summary

Cisco NX‑OS switches that have the SRv6 OAM feature turned on can be tricked by specially crafted network packets. An attacker could then run any code they want with full system rights or cause the switch to crash and stop working. Apply the latest software updates from Cisco and, if you do not need SRv6 OAM, disable that feature until you can patch the devices.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
cisco cisco nx-os software 9.3(3)
Original advisory text
Cisco Nexus 9000 Series Switches SRv6 OAM (NGOAM) Remote Code Execution Vulnerability
A vulnerability in the Segment Routing over IPv6 (SRv6) Operation, Administration, and Maintenance (OAM) feature of Cisco NX-OS Software, known as NGOAM, could allow an unauthenticated, remote attacker to execute arbitrary code with root privileges or cause a denial of service (DoS) on an affected device.

This vulnerability is due to improper input validation of IP traffic when the NGOAM and SRv6 features are enabled. An attacker could exploit this vulnerability by sending crafted packets to an IP interface on an affected device. A successful exploit could allow the attacker to execute arbitrary code with root privileges and could cause process crashes resulting in a reload and DoS condition.
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker full control
Severity
9.8 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-121Stack-based Buffer Overflow
Timeline
Published7 Oct 2026
Updated8 Oct 2026
First seen7 Oct 2026
Sources
CVE-2026-76501 · NVD
CVE-2026-76501 · MITRE
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