CVEvulnerability

CVE-2025-20362

8.6 HIGH Known exploited Published 2025-09-25 Modified 2026-10-18 Official page ↗

CISA Known Exploited Vulnerability

Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Missing Authorization Vulnerability — Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense

Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Software VPN Web Server contain a missing authorization vulnerability. This vulnerability could be chained with CVE-2025-20333.

Added to KEV: 2025-09-25
Remediation due: 2025-09-26
Ransomware use: Unknown
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.
Notes: CISA Mitigation Instructions: https://www.cisa.gov/news-events/directives/ed-25-03-identify-and-mitigate-potential-compromise-cisco-devices ; https://www.cisa.gov/news-events/directives/supplemental-direction-ed-25-03-core-dump-and-hunt-instructions ; https://www.cisa.gov/eviction-strategies-tool/create-from-template ; https://sec.cloudapps.cisco.com/security/center/resources/asa_ftd_continued_attacks ; https://sec.cloudapps.cisco.com/security/center/private/resources/asa_ftd_continued_attacks#Details ; https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-YROOTUW ; https://nvd.nist.gov/vuln/detail/CVE-2025-20362

Status: Analyzed
Published: 2025-09-25
Last modified: 2026-10-18
Assigner: [email protected]
CVSS 3.1 ([email protected]): 6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS 3.1 ([email protected]): 8.6 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Weaknesses: CWE-862

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.

Affected configurations

• cisco adaptive security appliance software (>= 9.12 < 9.12.4.72) • cisco adaptive security appliance software (>= 9.14 < 9.14.4.28) • cisco adaptive security appliance software (>= 9.16 < 9.16.4.85) • cisco adaptive security appliance software (>= 9.17.0 < 9.18.4.67) • cisco adaptive security appliance software (>= 9.19 < 9.20.4.10) • cisco adaptive security appliance software (>= 9.22 < 9.22.2.14) • cisco adaptive security appliance software (>= 9.23 < 9.23.1.19) • cisco secure firewall threat defense (>= 7.0.0 < 7.0.8.1) • cisco secure firewall threat defense (>= 7.1.0 < 7.2.10.2) • cisco secure firewall threat defense (>= 7.3.0 < 7.4.2.4) • cisco secure firewall threat defense (>= 7.6.0 < 7.6.2.1) • cisco secure firewall threat defense (>= 7.7.0 < 7.7.10.1)

Weakness · CWE (1)

CWE-862 Missing Authorization weakness

References