QwikSec

Security Database

CVE

CWE

Training

CVE Database
/

CVE-2026-20040

Back to search

CVE-2026-20040

Published: Mar 11, 2026

Modified: Mar 12, 2026

PUBLISHED

CVSS v3.1

8.8

HIGH

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.

VendorProductVersions

Cisco

Cisco IOS XR Software

affected
6.5.3
affected
6.5.29
affected
6.5.1
affected
6.6.1
affected
6.5.2

+111 more versions

Weaknesses (CWE)

CWE-78

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

References

Security Training

Train your team to recognize and prevent security threats with our comprehensive security awareness program.

Start Training

Vulnerability Scanning

Discover vulnerabilities in your applications and infrastructure before attackers do.

Scan Now