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CVE-2026-20040

nvd nist
Published: Mar 11, 2026Modified: Jul 1, 2026

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8.8
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Exploitability: 2.0 / Impact: 6.0
Source: psirt@cisco.com (Secondary)

Description

A vulnerability in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker to execute arbitrary commands as root on the underlying operating system of an affected device. This vulnerability is due to insufficient validation of user arguments that are passed to specific CLI commands. An attacker with a low-privileged account could exploit this vulnerability by using crafted commands at the prompt. A successful exploit could allow the attacker to elevate privileges to root and execute arbitrary commands on the underlying operating system.

Affected (2)

Products: Cisco: Ios Xr
Cisco
1 product
Ios Xr
Configuration A
2 vulnerable
Vulnerable SoftwareAffected Versions
Cisco
Ios Xr
Before 25.2.21
Ios Xr
From 25.3.1 to 25.4.2

Related CWEs

CWE-78
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

References (1)

Source: psirt@cisco.com
Vendor Advisory

Timeline

No history available yet.