CVE-2025-20363
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,
Description
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.
Weakness: CWE-122
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco Adaptive Security Appliance (ASA) Check your version | Firewall / NGFW | cna-assigner |
| Cisco | Cisco Firepower Threat Defense (FTD) Check your version | Firewall / NGFW | cna-assigner |
| Cisco | Cisco IOS Software | Routing & Switching | cna-assigner |
| Cisco | Cisco IOS XE Software | Routing & Switching | cna-assigner |
| Cisco | Cisco IOS XR Software | Routing & Switching | cna-assigner |
Vendor-reported products (5)
- Cisco · IOS
- Cisco · Cisco IOS XR Software
- Cisco · Cisco Adaptive Security Appliance (ASA) Software
- Cisco · Cisco IOS XE Software
- Cisco · Cisco Firepower Threat Defense Software
Vendor advisory
cisco-sa-http-code-exec-WmfP3h3O
Cisco Secure Firewall Adaptive Security Appliance Software, Secure Firewall Threat Defense Software, IOS Software, IOS XE Software, and IOS XR Software Web Services Remote Code Execution Vulnerability
Cisco’s rating: Critical (advisory CVSS 9.0) · Published Sep 25, 2025 · updated Nov 6, 2025 (revision 1.1)
Bug IDs: CSCwo18850 , CSCwo35704 , CSCwo35779 , CSCwo49562
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from