CVE-2025-20363
CriticalCVSS 9.0Exploitation Probability (EPSS)
Very high risk94th percentile - higher than 94% of all known CVEs
Summary
A vulnerability in the web services of Cisco Secure Firewall ASA, FTD, IOS, IOS XE, and IOS XR Software could allow an unauthenticated remote attacker (for ASA and FTD) or an authenticated remote attacker with low privileges (for IOS, IOS XE, IOS XR) to execute arbitrary code on an affected device. The issue is due to improper validation of user-supplied input in HTTP requests.
Risk Assessment
Successful exploitation could allow the attacker to execute arbitrary code as root, potentially leading to complete compromise of the device and network security breach.
Recommendation
Apply software updates provided by Cisco for all affected products and restrict access to web services to trusted sources only.
Original NVD description (English source)
A vulnerability in the web services of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, Cisco Secure Firewall Threat Defense (FTD) Software, Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an unauthenticated, remote attacker (Cisco ASA and FTD Software) or authenticated, remote attacker (Cisco IOS, IOS XE, and IOS XR Software) with low user privileges to execute arbitrary code on an affected device. This vulnerability is due to improper validation of user-supplied input in HTTP requests. An attacker could exploit this vulnerability by sending crafted HTTP requests to a targeted web service on an affected device after obtaining additional information about the system, overcoming exploit mitigations, or both. A successful exploit could allow the attacker to execute arbitrary code as root, which may lead to the complete compromise of the affected device. For more information about this vulnerability, see the Details ["#details"] section of this advisory.