CVE-2026-20040

CWE-78 — OS Command InjectionCWE-2645 documents5 sources
Severity
8.8HIGH
EPSS
0.0%
top 85.91%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
1
Cisco Cisco IOS XR Software
Timeline
PublishedMar 11

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 a…

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:HExploitability: 2.0 | Impact: 6.0

Affected Packages1 packages

▶CVEListV5cisco/cisco_ios_xr_software116 versions+115

🔴Vulnerability Details

2
GHSA
GHSA-4x82-6phf-h73c: A vulnerability in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker to execute arbitrary commands as root on the underlyi↗2026-03-11
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CVEList
Cisco IOS XR Software CLI Privilege Escalation Vulnerability↗2026-03-11
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📋Vendor Advisories

1
Cisco
Cisco IOS XR Software CLI Privilege Escalation Vulnerabilities↗2026-03-11
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CVE-2026-20040 (HIGH CVSS 8.8) | A vulnerability in the CLI of Cisco | cvebase.io