🛡️ CVE-2023-20135
🟡 CVSS 5.7 — Medium ✅ No Known Exploit CWE-347 NVD
5.7
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity MEDIUM
CVSS Score 5.7
CVSS Vector CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N
CWE CWE-347
Public Exploit ✅ No
Source NVD
Published 2023-09-13
Updated 2026-06-08
Modified 2024-11-21
Fix URL N/A

Affected Packages

Software From version Fixed in
ios-xr 7.7 7.10.1

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