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0 CVE-2023-20135 is a medium-severity vulnerability in Cisco IOS XR Software that involves improper verification of cryptographic signatures due to a TOCTOU race condition during ISO image installation. An authenticated local attacker with high privileges can exploit this flaw by modifying an ISO image and performing parallel install requests, potentially leading to arbitrary code execution on the device. The vulnerability affects multiple IOS XR versions including 7.5.x through 7.9.x. Exploitation does not require user interaction but does require local authentication and high privileges. No known exploits are currently reported in the wild. This vulnerability poses a significant risk to network infrastructure devices running affected IOS XR versions, especially in environments where local access is possible. Join the discussion | CVE Database V5 | 09/13/2023, 16:38:36 UTC Added: 12/16/2025, 17:18:46 UTC |
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