8.6

CVE-2025-20362: Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Missing Authorization Vulnerability

CVSS: 8.6v3.1HighKEVAnalyzed
Published 25-09-2025Last modified 26-02-2026
Open JSON

Vulnerability summary

CVE-2025-20362 is a high (CVSS 8.6) Missing Authorization vulnerability in Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense. It is known to be exploited: CISA lists it, first on 25-09-2025. EPSS estimates a 87.09% chance of exploitation in the next 30 days, higher than 99.7% of scored vulnerabilities.

Overall risk
85/100
0100
Critical · default modelHow is this calculated?
CVSS score
8.6/10
010
High · v3.1 (NVD)
EPSS score
87.09%
0%100%
Critical · 0.00 pp in 30 days
KEVListedCISA
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 25-09-2025
    PublishedVulnerability first disclosed.
  2. 25-09-2025
    Added to CISA KEVCisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Missing Authorization Vulnerability
  3. 26-09-2025
    CISA remediation dueApply mitigations per vendor instructions.
  4. 26-02-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

87.09%

Chance of exploitation in the next 30 days

Percentile

100%

Versus all other CVEs

30-day change

0.00 pp

From 87.09% on 18-09-2026

18-09-202618-10-2026
EPSS score
87.09%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
25-09-2025
Federal due date
26-09-2025

CISA 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. www.cisa.gov/news-events/directives/supplemental-direction-ed-25-03-core-dump-and-hunt-instructions www.cisa.gov/eviction-strategies-tool/create-from-template sec.cloudapps.cisco.com/security/center/resources/asa_ftd_continued_attacks sec.cloudapps.cisco.com/security/center/private/resources/asa_ftd_continued_attacks sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-YROOTUW nvd.nist.gov/vuln/detail/CVE-2025-20362

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Cisco4 products
  • adaptive_security_appliance_software≥ 9.12, < 9.12.4.72 | ≥ 9.14, < 9.14.4.28 | ≥ 9.16, < 9.16.4.85 | ≥ 9.17.0, < 9.18.4.67 | ≥ 9.19, < 9.20.4.10 | ≥ 9.22, < 9.22.2.14 | ≥ 9.23, < 9.23.1.19
  • cisco secure firewall adaptive security appliance (asa) software9.8.1 | 9.8.1.5 | 9.8.1.7 | 9.8.2 | 9.8.2.8 | 9.8.2.14 | 9.8.2.15 | 9.8.2.17 | 9.8.2.20 | 9.8.2.24 | 9.8.2.26 | 9.8.2.28 | 9.8.2.33 | 9.8.2.35 | 9.8.2.38 | 9.8.3.8 | 9.8.3.11 | 9.8.3.14 | 9.8.3.16 | 9.8.3.18 | 9.8.3.21 | 9.8.3 | 9.8.3.26 | 9.8.3.29 | 9.8.4 | 9.8.4.3 | 9.8.4.7 | 9.8.4.8 | 9.8.4.10 | 9.8.4.12 | 9.8.4.15 | 9.8.4.17 | 9.8.2.45 | 9.8.4.25 | 9.8.4.20 | 9.8.4.22 | 9.8.4.26 | 9.8.4.29 | 9.8.4.32 | 9.8.4.33 | 9.8.4.34 | 9.8.4.35 | 9.8.4.39 | 9.8.4.40 | 9.8.4.41 | 9.8.4.43 | 9.8.4.44 | 9.8.4.45 | 9.8.4.46 | 9.8.4.48 | 9.12.1 | 9.12.1.2 | 9.12.1.3 | 9.12.2 | 9.12.2.4 | 9.12.2.5 | 9.12.2.9 | 9.12.3 | 9.12.3.2 | 9.12.3.7 | 9.12.4 | 9.12.3.12 | 9.12.3.9 | 9.12.2.1 | 9.12.4.2 | 9.12.4.4 | 9.12.4.7 | 9.12.4.10 | 9.12.4.13 | 9.12.4.8 | 9.12.4.18 | 9.12.4.24 | 9.12.4.26 | 9.12.4.29 | 9.12.4.30 | 9.12.4.35 | 9.12.4.37 | 9.12.4.38 | 9.12.4.39 | 9.12.4.40 | 9.12.4.41 | 9.12.4.47 | 9.12.4.48 | 9.12.4.50 | 9.12.4.52 | 9.12.4.54 | 9.12.4.55 | 9.12.4.56 | 9.12.4.58 | 9.12.4.62 | 9.12.4.65 | 9.12.4.67 | 9.14.1 | 9.14.1.10 | 9.14.1.6 | 9.14.1.15 | 9.14.1.19 | 9.14.1.30 | 9.14.2 | 9.14.2.4 | 9.14.2.8 | 9.14.2.13 | 9.14.2.15 | 9.14.3 | 9.14.3.1 | 9.14.3.9 | 9.14.3.11 | 9.14.3.13 | 9.14.3.18 | 9.14.3.15 | 9.14.4 | 9.14.4.6 | 9.14.4.7 | 9.14.4.12 | 9.14.4.13 | 9.14.4.14 | 9.14.4.15 | 9.14.4.17 | 9.14.4.22 | 9.14.4.23 | 9.14.4.24 | 9.16.1 | 9.16.1.28 | 9.16.2 | 9.16.2.3 | 9.16.2.7 | 9.16.2.11 | 9.16.2.13 | 9.16.2.14 | 9.16.3 | 9.16.3.3 | 9.16.3.14 | 9.16.3.15 | 9.16.3.19 | 9.16.3.23 | 9.16.4 | 9.16.4.9 | 9.16.4.14 | 9.16.4.18 | 9.16.4.19 | 9.16.4.27 | 9.16.4.38 | 9.16.4.39 | 9.16.4.42 | 9.16.4.48 | 9.16.4.55 | 9.16.4.57 | 9.16.4.61 | 9.16.4.62 | 9.16.4.67 | 9.16.4.70 | 9.16.4.71 | 9.16.4.76 | 9.16.4.82 | 9.16.4.84 | 9.17.1 | 9.17.1.7 | 9.17.1.9 | 9.17.1.10 | 9.17.1.11 | 9.17.1.13 | 9.17.1.15 | 9.17.1.20 | 9.17.1.30 | 9.17.1.33 | 9.17.1.39 | 9.17.1.45 | 9.17.1.46 | 9.18.1 | 9.18.1.3 | 9.18.2 | 9.18.2.5 | 9.18.2.7 | 9.18.2.8 | 9.18.3 | 9.18.3.39 | 9.18.3.46 | 9.18.3.53 | 9.18.3.55 | 9.18.3.56 | 9.18.4 | 9.18.4.5 | 9.18.4.8 | 9.18.4.22 | 9.18.4.24 | 9.18.4.29 | 9.18.4.34 | 9.18.4.40 | 9.18.4.47 | 9.18.4.50 | 9.18.4.52 | 9.18.4.53 | 9.18.4.57 | 9.18.4.66 | 9.19.1 | 9.19.1.5 | 9.19.1.9 | 9.19.1.12 | 9.19.1.18 | 9.19.1.22 | 9.19.1.24 | 9.19.1.27 | 9.19.1.28 | 9.19.1.31 | 9.19.1.37 | 9.19.1.38 | 9.19.1.42 | 9.20.1 | 9.20.1.5 | 9.20.2 | 9.20.2.10 | 9.20.2.21 | 9.20.2.22 | 9.20.3 | 9.20.3.4 | 9.20.3.7 | 9.20.3.9 | 9.20.3.10 | 9.20.3.13 | 9.20.3.16 | 9.20.3.20 | 9.20.4 | 9.20.4.7 | 9.22.1.1 | 9.22.1.3 | 9.22.1.2 | 9.22.1.6 | 9.22.2 | 9.22.2.4 | 9.22.2.9 | 9.22.2.13 | 9.23.1 | 9.23.1.3 | 9.23.1.7 | 9.23.1.13
  • cisco secure firewall threat defense (ftd) software6.2.3 | 6.2.3.1 | 6.2.3.2 | 6.2.3.3 | 6.2.3.4 | 6.2.3.5 | 6.2.3.6 | 6.2.3.7 | 6.2.3.8 | 6.2.3.10 | 6.2.3.11 | 6.2.3.9 | 6.2.3.12 | 6.2.3.13 | 6.2.3.14 | 6.2.3.15 | 6.2.3.16 | 6.2.3.17 | 6.2.3.18 | 6.6.0 | 6.6.0.1 | 6.6.1 | 6.6.3 | 6.6.4 | 6.6.5 | 6.6.5.1 | 6.6.5.2 | 6.6.7 | 6.6.7.1 | 6.6.7.2 | 6.4.0 | 6.4.0.1 | 6.4.0.3 | 6.4.0.2 | 6.4.0.4 | 6.4.0.5 | 6.4.0.6 | 6.4.0.7 | 6.4.0.8 | 6.4.0.9 | 6.4.0.10 | 6.4.0.11 | 6.4.0.12 | 6.4.0.13 | 6.4.0.14 | 6.4.0.15 | 6.4.0.16 | 6.4.0.17 | 6.4.0.18 | 7.0.0 | 7.0.0.1 | 7.0.1 | 7.0.1.1 | 7.0.2 | 7.0.2.1 | 7.0.3 | 7.0.4 | 7.0.5 | 7.0.6 | 7.0.6.1 | 7.0.6.2 | 7.0.6.3 | 7.0.7 | 7.0.8 | 7.1.0 | 7.1.0.1 | 7.1.0.2 | 7.1.0.3 | 7.2.0 | 7.2.0.1 | 7.2.1 | 7.2.2 | 7.2.3 | 7.2.4 | 7.2.4.1 | 7.2.5 | 7.2.5.1 | 7.2.6 | 7.2.7 | 7.2.5.2 | 7.2.8 | 7.2.8.1 | 7.2.9 | 7.2.10 | 7.3.0 | 7.3.1 | 7.3.1.1 | 7.3.1.2 | 7.4.0 | 7.4.1 | 7.4.1.1 | 7.4.2 | 7.4.2.1 | 7.4.2.2 | 7.4.2.3 | 7.6.0 | 7.6.1 | 7.6.2 | 7.7.0 | 7.7.10
  • secure_firewall_threat_defense≥ 7.0.0, < 7.0.8.1 | ≥ 7.1.0, < 7.2.10.2 | ≥ 7.3.0, < 7.4.2.4 | ≥ 7.6.0, < 7.6.2.1 | ≥ 7.7.0, < 7.7.10.1

1 vendor · 4 products

References

3 links