# CVE-2025-20362: Cisco Adaptive Security Appliance (ASA) Software - Authentication Bypass

> Live exploitation tracking for CVE-2025-20362 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2025-20362

## Key facts

- **Exploitation phase:** Background Noise. Continuous low-level scanning or exploitation attempts are observed, mostly opportunistic and automated.
- **CVSS score:** 6.5
- **Public exploit available:** Yes
- **Affected products:** Cisco Adaptive Security Appliance (ASA) Software, Cisco Firepower Threat Defense Software
- **Weaknesses:** CWE-862 (Missing Authorization)
- **Tags:** firewall

## 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.

## CrowdSec analysis

[CVE-2025-20362](https://euvd.enisa.europa.eu/vulnerability/CVE-2025-20362) is a vulnerability in the VPN web server of Cisco ASA and Firepower Threat Defense Software that allows unauthenticated, remote attackers to access restricted VPN-related URL endpoints. By exploiting improper validation of user input in HTTP(S) requests, attackers can bypass authentication controls and gain unauthorized access to sensitive resources, potentially exposing confidential information or enabling further attacks.

CrowdSec has been tracking this vulnerability and its exploits since 15th of October 2025.

CrowdSec network data shows that most actors exploiting CVE-2025-20362 rely on broad, untargeted scans with minimal filtering. The activity is largely automated and opportunistic in nature.
Additionally, according to week-over-week analysis by CrowdSec, exploitation of CVE-2025-20362 is surging. Attack volumes are spiking well above historical norms, indicating widespread and escalating interest from threat actors. CVE-2025-20362 is currently experiencing high visibility and active exploitation across the internet.

Attackers exploit this vulnerability by sending crafted requests to URLs containing `/+CSCOU+//../+CSCOE+/files/file_action.html`, targeting restricted VPN web server endpoints on Cisco ASA and FTD devices to bypass authentication.

## Timeline

- 2025-09-25: CVE Published. CVE-2025-20362 is published to NVD.
- 2025-09-25: CISA KEV. CVE-2025-20362 is added to the Known Exploited Vulnerabilities catalog by CISA.
- 2025-09-26: CISA Remediation Deadline. Expiration of the CISA remediation deadline as described in [BOD 22-01](https://www.cisa.gov/news-events/directives/bod-22-01-reducing-significant-risk-known-exploited-vulnerabilities).
- 2025-10-15: Rule Released. CrowdSec releases a rule to detect CVE-2025-20362 exploitation attempts against the CrowdSec Network.
- 2025-10-27: CrowdSec First Seen. CrowdSec observes in-the-wild exploitation of CVE-2025-20362 for the first time.

## References

- https://sec.cloudapps.cisco.com/security/center/resources/asa_ftd_continued_attacks
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-YROOTUW
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-20362.yaml

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2025-20362) follows observed exploitation activity for CVE-2025-20362. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.