CVE-2025-20333

CRITICAL CISA KEV EPSS 98.5%
Published Sep 25, 20259mo ago · Modified Jun 17, 20261w ago
9.9 CVSS 3.1
Critical
Find Similar
Published Sep 25, 2025 9mo ago
Last Modified Jun 17, 2026 1w ago
KEV Listed Sep 25, 2025 9mo ago
KEV Due Sep 26, 2025 277d overdue

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 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 complete compromise of the affected device.

CVSS Details

Base Score
9.9
Exploitability
3.1
Impact
6.0
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Changed
Confidentiality High
Integrity High
Availability High

Threat Intelligence

CISA Known Exploited Overdue 277d
Added
Sep 25, 2025
Due
Sep 26, 2025

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.

EPSS Exploit Probability
98.5% percentile
Exploit & Patch Status
Actively Exploited (KEV)
No Patch Available

Weaknesses 1

CWE-120

Affected Products 12

VendorProductVersionRange
ciscoadaptive_security_appliance_software*≥9.12  –  <9.12.4.72
ciscoadaptive_security_appliance_software*≥9.14  –  <9.14.4.28
ciscoadaptive_security_appliance_software*≥9.16  –  <9.16.4.85
ciscoadaptive_security_appliance_software*≥9.17.0  –  <9.17.1.45
ciscoadaptive_security_appliance_software*≥9.18  –  <9.18.4.47
ciscoadaptive_security_appliance_software*≥9.19  –  <9.19.1.37
ciscoadaptive_security_appliance_software*≥9.20  –  <9.20.3.7
ciscoadaptive_security_appliance_software*≥9.22  –  <9.22.1.3
ciscofirepower_threat_defense*≥7.0.0  –  <7.0.8.1
ciscofirepower_threat_defense*≥7.1.0  –  <7.2.9
ciscofirepower_threat_defense*≥7.3.0  –  <7.4.2.4
ciscofirepower_threat_defense7.6.0any

References 3

  • sec.cloudapps.cisco.com https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-z5xP8EUB
    Vendor Advisory
  • sec.cloudapps.cisco.com https://sec.cloudapps.cisco.com/security/center/resources/asa_ftd_continued_attacks
    Vendor Advisory
  • cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-20333
    US Government Resource

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.