Uncontrolled memory allocation in Cisco NX-OS - CVE-2026-20048
Published: February 26, 2026
Vulnerability identifier: #VU123288
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-20048
CWE-ID: CWE-789
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to perform a denial of service attack.
The vulnerability exists due to a boundary error in the Simple Network Management Protocol (SNMP) subsystem. A remote user with read-only access can send specially crafted SNMP packets to the device and perform a denial of service attack. SNMP versions 1, 2c, and 3 are affected.
Affected software
Cisco NX-OS
How to mitigate CVE-2026-20048
Install updates from vendor's website.
Cisco NX-OS - addressed in versions 16.1(5e), 16.2(1g)