vulnerability

Cisco IOS-XR: CVE-2023-20135: Cisco IOS XR Software Image Verification Vulnerability

Severity
6
CVSS
(AV:L/AC:M/Au:M/C:C/I:C/A:N)
Published
Sep 13, 2023
Added
Sep 15, 2023
Modified
Jul 3, 2025

Description

A vulnerability in Cisco IOS XR Software image verification checks could allow an authenticated, local attacker to execute arbitrary code on the underlying operating system.

This vulnerability is due to a time-of-check, time-of-use (TOCTOU) race condition when an install query regarding an ISO image is performed during an install operation that uses an ISO image. An attacker could exploit this vulnerability by modifying an ISO image and then carrying out install requests in parallel. A successful exploit could allow the attacker to execute arbitrary code on an affected device.

Solution

update-xros
Title
NEW

Explore Exposure Command

Confidently identify and prioritize exposures from endpoint to cloud with full attack surface visibility and threat-aware risk context.