CVE-2025-20362

medium

Description

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.

https://www.zscaler.com/blogs/security-research/cisco-firewall-and-vpn-zero-day-attacks-cve-2025-20333-and-cve-2025-20362

https://www.theregister.com/2025/09/26/cisco_firewall_flaws/

https://www.securityweek.com/cisco-firewall-zero-days-exploited-in-china-linked-arcanedoor-attacks/

https://www.infosecurity-magazine.com/news/arcanedoor-attacks-against-cisco/

https://www.helpnetsecurity.com/2025/09/26/cisco-asa-zero-day-attacks/

https://unit42.paloaltonetworks.com/zero-day-vulnerabilities-affect-cisco-software/

https://thehackernews.com/2025/09/cisco-asa-firewall-zero-day-exploits.html

https://securityaffairs.com/182639/hacking/uk-ncsc-warns-that-attackers-exploited-cisco-firewall-zero-days-to-deploy-rayinitiator-and-line-viper-malware.html

https://www.darkreading.com/vulnerabilities-threats/cisco-actively-exploited-zero-day-bugs-firewalls-ios

https://www.bleepingcomputer.com/news/security/cisco-warns-of-asa-firewall-zero-days-exploited-in-attacks/

https://www.bleepingcomputer.com/news/security/cisa-orders-agencies-to-patch-cisco-flaws-exploited-in-zero-day-attacks/

https://therecord.media/cisco-asa-firewall-bugs-cisa-federal-agencies-warning

https://thehackernews.com/2025/09/urgent-cisco-asa-zero-day-duo-under.html

https://securityaffairs.com/182593/hacking/u-s-cisa-adds-cisco-secure-firewall-asa-and-secure-ftd-flaws-to-its-known-exploited-vulnerabilities-catalog.html

https://sec.cloudapps.cisco.com/security/center/resources/asa_ftd_continued_attacks

https://cyberscoop.com/cisa-emergency-directive-cisco-zero-days/

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-YROOTUW

Details

Source: Mitre, NVD

Published: 2025-09-25

Updated: 2025-09-26

Risk Information

CVSS v2

Base Score: 6.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 6.5

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Severity: Medium

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest

Detections

Analytics