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CVE-2023-20135

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CVE-2023-20135

Published: Sep 13, 2023

Modified: Dec 16, 2025

PUBLISHED

CVSS v3.1

5.7

MEDIUM

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.

VendorProductVersions

Cisco

Cisco IOS XR Software

affected
7.5.3
affected
7.5.2
affected
7.5.4
affected
7.7.1
affected
7.7.2

+5 more versions

Weaknesses (CWE)

CWE-347

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Local

Attack Complexity

High

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

References

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