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HIGH

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

Published Sep 13, 2023

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.

Affected products

Remediation

No remediation recorded yet.

Weaknesses (2)

CWE-347

CWE-367

References (1)

Change history (0)

No recorded changes yet.

Sources
CVE.org / MITRE
Status PUBLISHED
Assigner cisco
Published Sep 13, 2023
Updated Dec 16, 2025
Reserved Oct 27, 2022
Link CVE-2023-20135
CISA Vulnrichment
Updated Nov 15, 2023
NVD
Status Modified
Modified Jun 17, 2026
Link CVE-2023-20135
Red Hat
Severity n/a
Public date n/a
Links CVE-2023-20135