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Home - Vulnerability NotesPrint
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CERT-In Vulnerability Note CIVN-2026-0132
Privilege Escalation Vulnerability in CISCO

Original Issue Date:March 12, 2026

Severity Rating: HIGH

Systems Affected

  • Cisco IOS XR Software
  • Cisco IOS XRv 9000 Routers

Overview

Multiple  vulnerabilities have been reported in Cisco IOS XR Software could allow an  authenticated, local attacker to execute commands as root on an underlying operating system or gain full administrative control of an affected device.

Target Audience: 
All IT administrators and individuals responsible for maintaining and updating in Software.

Risk Assessment:
High risk of data manipulation and service disruption.

Impact Assessment:
Potential impact on confidentiality, integrity, and availability of the system.

Description

These vulnerabilities exist due to insufficient validation of user arguments that are passed to specific CLI commands and incorrect mapping of a command to task groups within the source code. An attacker could exploit this vulnerability by using crafted commands at the prompt and   CLI command to bypass the task group-based checks.

Successful exploitation of this vulnerability could allow the attacker to elevate privileges to root and execute arbitrary commands on the underlying operating system and perform actions on an affected device without authorization checks.

Solution

Apply appropriate updates as mentioned in Cisco Advisory
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-privesc-bF8D5U4W

Vendor Information

CISCO
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-privesc-bF8D5U4W

References

CISCO
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-privesc-bF8D5U4W

CVE Name
CVE-2026-20040
CVE-2026-20046

Disclaimer

The information provided herein is on "as is" basis, without warranty of any kind.

Contact Information

Email: info@cert-in.org.in
Phone: +91-11-22902657

Postal address

Indian Computer Emergency Response Team (CERT-In)
Ministry of Electronics and Information Technology
Government of India
Electronics Niketan
6, CGO Complex, Lodhi Road,
New Delhi - 110 003
India

 
Indian Computer Emergency Response Team - CERT-In, Ministry of Electronics and Information Technology, Government of India.
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