CVEvulnerability

CVE-2023-20135

7.0 HIGH Published 2023-09-13 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2023-09-13
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
5.7 MEDIUM — CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N
CVSS 3.1 ([email protected])
7.0 HIGH — CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-347, CWE-367

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 configurations

• cisco ios xr (>= 7.5.2 < 7.6) • cisco ios xr (>= 7.7 < 7.10.1)

Related

Weakness · CWE (2)

  • CWE-347 Improper Verification of Cryptographic Signature weakness
  • CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition weakness

References