CVSS 3.1 Score 7.0 of 10 (high)


Published Sep 13, 2023
Updated: Jan 25, 2024
CWE ID 367
CWE ID 347


CVE-2023-20135 is a vulnerability in Cisco IOS XR Software image verification checks that could allow an authenticated, local attacker to execute arbitrary code on the underlying operating system. This vulnerability is caused by a time-of-check, time-of-use (TOCTOU) race condition during an install operation using an ISO image. The attacker can exploit this vulnerability by modifying the ISO image and performing install requests in parallel. Successful exploitation of this vulnerability could result in the execution of arbitrary code on the affected device. The vulnerability affects various Cisco products including tIzzQU, sshdG8, tJfVxi, tIzzQQ, tIzzQS, tIzzQT, tIzzQO, tIzzQP, sshdHC, sshdHA, and sshdHB. It has a high severity rating with a base score of 7.0 and poses a high risk to confidentiality and integrity of data. There is currently no remediation information available for this vulnerability.

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