Vulnerability in Cisco Ios Xr Software
CVE-2023-20135
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.
EPSS: 0.001 (0.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N.
Affected products
- Cisco Ios Xr Software — versions 7.5.3, 7.5.2, 7.5.4
- Cisco Ios_xr
Weakness classification (CWE)
References
- psirt@cisco.com (Vendor Advisory)
Frequently asked questions
- What is CVE-2023-20135?
- CVE-2023-20135 is a medium-severity vulnerability in Cisco Ios Xr Software, classified under Improper Verification of Cryptographic Signature. CVSS score: 5.7/10. Published 2023-09-13.
- How severe is CVE-2023-20135?
- Medium severity. CVSS v3 base score is 5.7 out of 10.