CVE-2025-20362: Cisco Secure Firewall Adaptive Security Appliance (ASA) Software · Missing Authorization
Affects Cisco Secure Firewall Adaptive Security Appliance (ASA) SoftwareSource CVE Database V5
Mentioned vulnerabilities
Exploited in the wild · KEV due 26 Sep 2025 · public detection template (Nuclei) · 87% EPSS : apply the vendor's fix or mitigations to Cisco Secure Firewall Adaptive Security Appliance (ASA) Software now.
Data as of 26 Oct 2026, 07:57 UTC
- KEV deadline
- US federal agencies must patch by this date; a sensible deadline for everyone else.
- EPSS
- 87.0% chance of exploitation in 30 days – higher than 99% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:NExploitation evidence
t = 0 is the CVE’s publication on cve.org
Disclosed: evidence found.
CVE published 25 Sep 2025
Detectable: evidence found.
nuclei template: Cisco Secure Firewall ASA & FTD - Authentication Bypass
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: evidence found.
Listed in CISA KEV the same day as disclosure
Observed by OffSeq MirageSeen by Mirage: evidence found.
5 exposed hosts found; no attack traffic recorded
Timeline
CVE ID reserved
by cisco
, 350 days before disclosure
CVE published
on cve.org
, t = 0
In Threat Radar
record ingested
, 2 minutes after disclosure
Added to CISA KEV (opens in a new tab)
exploitation confirmed
, the same day as disclosure
KEV remediation due
US federal deadline
, 1 day after disclosure
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CISA KEV (opens in a new tab), OffSeq Mirage (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.
What to do
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.
- cisa.gov/news-events/directives/ed-25-03-identify-and-mitigate-potential-compromise-cisco-devices (opens in a new tab)
- cisa.gov/news-events/directives/supplemental-direction-ed-25-03-core-dump-and-hunt-instructions (opens in a new tab)
- cisa.gov/eviction-strategies-tool/create-from-template (opens in a new tab)
- sec.cloudapps.cisco.com/security/center/resources/asa_ftd_continued_attacks (opens in a new tab)
- sec.cloudapps.cisco.com/security/center/private/resources/asa_ftd_continued_attacks (opens in a new tab)
- sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-YROOTUW (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2025-20362 (opens in a new tab)
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | Affected
| Fixed in– |
Check the firmware or software version for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software in the device's admin interface against the vendor advisory.
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.
References
- sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-YROOTUW (opens in a new tab)
- sec.cloudapps.cisco.com/security/center/resources/asa_ftd_continued_attacks (opens in a new tab)
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-20362 (opens in a new tab)