CVE-2025-20362

Published Sep 25, 2025

Last updated 7 months ago

Exploit known CVSS medium 6.5

Cisco ASA

Cisco FTD

VPN

Port (443)

Overview

AI description

Automated description summarized from trusted sources.

CVE-2025-20362 is a vulnerability found in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software. It could allow an unauthenticated, remote attacker to access restricted URL endpoints that should normally require authentication. This vulnerability is due to improper validation of user-supplied input in HTTP(S) requests. An attacker could exploit it by sending crafted HTTP requests to a targeted web server, potentially gaining access to restricted URLs without proper authentication. Cisco has released software updates to address this vulnerability.

Description: Update: On November 5, 2025, Cisco became aware of a new attack variant against devices running Cisco Secure ASA Software or Cisco Secure FTD Software releases that are affected by CVE-2025-20333 and CVE-2025-20362. This attack can cause unpatched devices to unexpectedly reload, leading to denial of service (DoS) conditions. Cisco strongly recommends that all customers upgrade to the fixed software releases that are listed in the Fixed Software ["#fs"] section of this advisory. A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to access restricted URL endpoints that are related to remote access VPN that should otherwise be inaccessible without authentication. This vulnerability is due to improper validation of user-supplied input in HTTP(S) requests. An attacker could exploit this vulnerability by sending crafted HTTP requests to a targeted web server on a device. A successful exploit could allow the attacker to access a restricted URL without authentication.
Source: psirt@cisco.com
NVD status: Analyzed
Products: adaptive_security_appliance_software, firepower_threat_defense

Risk scores

CVSS 3.1

Type: Primary
Base score: 8.6
Impact score: 4.7
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Severity: HIGH

Known exploits

Data from CISA

Vulnerability name: Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Missing Authorization Vulnerability
Exploit added on: Sep 25, 2025
Exploit action due: Sep 26, 2025
Required action: The KEV due date refers to the deadline by which FCEB agencies are expected to review and begin implementing the guidance outlined in Emergency Directive (ED) 25-03 (URL listed below in Notes). Agencies must follow the mitigation steps provided by CISA (URL listed below in Notes) and vendor’s instructions (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.

Weaknesses

psirt@cisco.com: CWE-862

Hype score: Not currently trending

Configurations

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References

Sources include official advisories and independent security research.