Buffer Access with Incorrect Length Value in Cisco NX-OS - CVE-2026-20033
Published: February 26, 2026
Vulnerability identifier: #VU123290
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-20033
CWE-ID: CWE-805
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vendor: Cisco Systems, Inc
Affected software:
Cisco NX-OS
Cisco NX-OS
Detailed vulnerability description
The vulnerability allows a remote attacker to perform a denial of service attack.
The vulnerability exists due to improper input validation when processing specific Ethernet frames. A remote attacker on the local network can send specially crafted data to the out-of-band (OOB) management interface of an affected device and perform a denial of service attack.
How to mitigate CVE-2026-20033
Install updates from vendor's website.