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CISA KEV · Known exploitedCritical

CVE-2025-20333

Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense

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 authenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to improper validation of user-supplied input in HTTP(S) requests. An attacker with valid VPN user credentials could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code as root, possibly resulting in the complet...

CVSS
9.9
EPSS
40.4%
98.5% percentile
CISA KEV
Listed
Published
2025.09.26
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability40.4%
Technical severityCVSS 9.9

Vulnerability overview

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 authenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to improper validation of user-supplied input in HTTP(S) requests. An attacker with valid VPN user credentials could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code as root, possibly resulting in the complet...

Affected product and versions

Product
Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense
Affected versions
9.8.1, 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
Fixed versions
9.12.4.72, 9.14.4.28, 9.16.4.85, 9.17.1.45, 9.18.4.47, 9.19.1.37, 9.20.3.7, 9.22.1.3, 7.0.8.1, 7.2.9, 7.4.2.4

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
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.

Due date: 2025.09.26
  1. 1
    Identify

    Confirm that Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE
CWE-120
KEV added
2025.09.25
Ransomware use
미확인
CVE-2025-20333 — Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense | SECUFOCUS NOW