CVE-2023-20135

HighCVSS 7.0/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 7.0/10CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-347CWE-367

Affected software

No affected versions have been published.

Timeline

Published
Sep 13, 2023
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2023-20135: High severity, CVSS 7.0 | Vulnix