# CVE-2025-20363: Cisco multiple platforms code execution in web services

Source: https://junglewise.ai/threats/cve-2025-20363-cisco-multiple-platforms-code-execution-in-web-services  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-09-25. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2025-20363 · Severity: critical · CVSS 9 · Published 2025-09-25

Cisco Secure Firewall ASA, Threat Defense, and multiple IOS platforms include web service components (SSL VPN, management interfaces) used to manage and provide remote access to network devices. An unauthenticated attacker can send specially crafted HTTP requests to exploit improper input validation, achieving arbitrary code execution with root privileges and complete device compromise.

Technologies: [Cisco Ios Software](https://junglewise.ai/threats/technologies/ios-software), [Cisco IOS XE Software](https://junglewise.ai/threats/technologies/ios-xe-software), [Cisco IOS XR Software](https://junglewise.ai/threats/technologies/ios-xr-software), [Cisco Secure Firewall ASA Software](https://junglewise.ai/threats/technologies/secure-firewall-asa-software), [Cisco Secure Firewall Threat Defense Software](https://junglewise.ai/threats/technologies/firepower-threat-defense-software). Vendors: [Cisco](https://junglewise.ai/threats/vendors/cisco).

## Quick answers

**Is CVE-2025-20363 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-20363 being exploited in the wild.

**How severe is CVE-2025-20363?** Critical severity, with a CVSS score of 9, published 25 September 2025.

**Which products and versions are affected?** Cisco Ios Software Versions with Remote Access SSL VPN feature enabled; Cisco IOS XE Software Versions with Remote Access SSL VPN feature enabled; Cisco IOS XR Software 32-bit versions on Cisco ASR 9001 Routers with HTTP server enabled; Cisco Secure Firewall ASA Software Multiple versions with vulnerable configuration (see advisory for details); and 1 more.

**Is there a fix for CVE-2025-20363?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2025-20363 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2025-20363?** Check whether you run Cisco Ios Software, Cisco IOS XE Software, Cisco IOS XR Software or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

This vulnerability exists in the HTTP request handling of web services across multiple Cisco platforms due to improper validation of user-supplied input (CWE-122). For ASA and FTD, the attack requires no authentication; for IOS, IOS XE, and IOS XR, the attacker must be authenticated with low privileges. The vulnerability is reachable over the network on any affected device with vulnerable configuration features enabled (SSL VPN, Remote Access VPN, or HTTP server). A successful exploit allows arbitrary code execution as root. Patches have been released by Cisco. The vulnerability has not been observed exploited in the wild as of the published date, though post-disclosure exploitation may occur.

## Affected products

- Cisco Secure Firewall ASA Software Multiple versions with vulnerable configuration (see advisory for details)
- Cisco Secure Firewall Threat Defense Software Multiple versions with vulnerable configuration (see advisory for details)
- Cisco IOS Software Versions with Remote Access SSL VPN feature enabled
- Cisco IOS XE Software Versions with Remote Access SSL VPN feature enabled
- Cisco IOS XR Software 32-bit versions on Cisco ASR 9001 Routers with HTTP server enabled

## Timeline

- 2025-09-25: disclosed: Cisco security advisory published
- 2025-11-06: other: Advisory last updated (Version 1.1)

## References

- [https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-http-code-exec-WmfP3h3O](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-http-code-exec-WmfP3h3O)

## Related threats

- [Cisco Secure Firewall ASA and FTD SSL VPN denial of service](https://junglewise.ai/threats/cve-2026-76418-a-vulnerability-in-the-remote-access-ssl-vpn-service-of-cisco)
- [Cisco Snort 3 GRE detection engine denial of service](https://junglewise.ai/threats/cve-2026-20179-multiple-cisco-products-are-affected-by-a-vulnerability-in-the)
- [Cisco Secure Firewall ASA calculation error in security-critical context](https://junglewise.ai/threats/cve-2026-20335-cisco-secure-firewall-asa-calculation-error-in-security-critical)
- [Cisco Secure Firewall improper adherence to coding standards](https://junglewise.ai/threats/cve-2026-20334-cisco-secure-firewall-improper-adherence-to-coding-standards)
- [Cisco Secure Firewall ASA/FTD/FMC incorrect comparison in security context](https://junglewise.ai/threats/cve-2026-20333-cisco-secure-firewall-asa-ftd-fmc-incorrect-comparison-in)