CVE-2025-20363

Published Sep 25, 2025

Last updated 4 months ago

CVSS critical 9.0

Cisco ASA

Cisco FTD

SSL

Overview

AI description

Automated description summarized from trusted sources.

CVE-2025-20363 is a vulnerability that affects 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. It could allow an unauthenticated, remote attacker (for Cisco ASA and FTD Software) or an authenticated, remote attacker with low user privileges (for Cisco IOS, IOS XE, and IOS XR Software) 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, potentially leading to the execution of arbitrary code as root and complete compromise of the device.

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.
Source: psirt@cisco.com
NVD status: Analyzed
Products: ios_xr, adaptive_security_appliance_software, ios, ios_xe, firepower_threat_defense

Risk scores

CVSS 3.1

Type: Secondary
Base score: 9
Impact score: 6
Exploitability score: 2.2
Vector string: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Severity: CRITICAL

Weaknesses

psirt@cisco.com: CWE-122

Hype score: Not currently trending

Configurations

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References

Sources include official advisories and independent security research.