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

CVE-2025-20362

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

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.

MEDIUM · CVSS 6.5 ⚠ CISA KEV EPSS 0.46779
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • SSVC exploitation status: active
  • EPSS ≥ 0.10 - elevated exploitation probability
  • EPSS percentile: top 2% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • SSVC automatable: yes - attacks can be scripted at scale
Sigma rules0 YARA rules0
⬢

Required Remediation

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.

⬡

Weakness Classification

CWE-862Missing Authorization
▤

Affected Products & Versions

12
cisco adaptive security appliance software>= 9.12 and < 9.12.4.72
cisco adaptive security appliance software>= 9.14 and < 9.14.4.28
cisco adaptive security appliance software>= 9.16 and < 9.16.4.85
cisco adaptive security appliance software>= 9.17.0 and < 9.18.4.67
cisco adaptive security appliance software>= 9.19 and < 9.20.4.10
cisco adaptive security appliance software>= 9.22 and < 9.22.2.14
cisco adaptive security appliance software>= 9.23 and < 9.23.1.19
cisco firepower threat defense>= 7.0.0 and < 7.0.8.1
⚠

Public Exploits & PoCs

1
nucleiCisco Secure Firewall ASA & FTD - Authentication Bypassmedium
◈

Detection Rules (IDS/IPS)

1
et-openET WEB_SERVER Cisco ASA/FTD WebVPN Authentication Bypass (CVE-2025-20362)web-application-attack
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
▣

Scoring & Timeline

6.5
MEDIUM · CVSS v3.1 · psirt@cisco.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD25 Sep 2025 · 04:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

7
cisco-psirtcisco-sa-asaftd-persist-CISAED25-03
cisco-csafcisco-sa-asaftd-persist-CISAED25-03
cisaKEV-CVE-2025-20362
cisco-csafcisco-sa-asaftd-webvpn-YROOTUW
cisco-csafcisco-sa-asaftd-webvpn-z5xP8EUB
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-YROOTUWVendor Advisory
https://sec.cloudapps.cisco.com/security/center/resources/asa_ftd_continued_attacksVendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-20362US Government Resource
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