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CVE-2025-20244— Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access VPN Web Server Denial of Service Vulnerability

Quick assessment

Affected
Cisco Cisco Adaptive Security Appliance (ASA) Software
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cisco Secure Firewall Adaptive Security Appliance和Cisco Secure Firewall Threat Defense都是美国思科（Cisco）公司的产品。Cisco Secure Firewall Adaptive Security Appliance是一个企业级防火墙软件。Cisco Secure Firewall Threat Defense是一个集成式防火墙平台。 Cisco Secure Firewall Adaptive Security

CVSS 7.7 · High EPSS 0.54% · P43

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-20244

Vulnerability Information
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Vulnerability Title
Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access VPN Web Server Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the Remote Access SSL VPN service for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow a remote attacker that is authenticated as a VPN user to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to incomplete error checking when parsing an HTTP header field value. An attacker could exploit this vulnerability by sending a crafted HTTP request to a targeted Remote Access SSL VPN service on an affected device. A successful exploit could allow the attacker to cause a DoS condition, which would cause the affected device to reload.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1287
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Secure Firewall Adaptive Security Appliance和Cisco Secure Firewall Threat Defense 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Secure Firewall Adaptive Security Appliance和Cisco Secure Firewall Threat Defense都是美国思科（Cisco）公司的产品。Cisco Secure Firewall Adaptive Security Appliance是一个企业级防火墙软件。Cisco Secure Firewall Threat Defense是一个集成式防火墙平台。 Cisco Secure Firewall Adaptive Security
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.12.3 -
Cisco Cisco Firepower Threat Defense Software 6.2.3.14 -

II. Public POCs for CVE-2025-20244

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2025-20244

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Same Patch Batch · Cisco · 2025-08-14 · 29 CVEs total

CVE-2025-20265 10.0 CRITICAL Cisco Secure Firewall Management Center Software Radius Remote Code Execution Vulnerabilit
CVE-2025-20133 8.6 HIGH Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Softw
CVE-2025-20134 8.6 HIGH Cisco Adaptive Security Appliance and Firepower Threat Defense Software SSL/TLS Certificat
CVE-2025-20136 8.6 HIGH Cisco Adaptive Security Appliance and Firepower Threat Defense Software Network Address Tr
CVE-2025-20263 8.6 HIGH Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Servi
CVE-2025-20253 8.6 HIGH Cisco IOS, IOS XE, Secure Firewall Adaptive Security Appliance, and Secure Firewall Threat
CVE-2025-20243 8.6 HIGH Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Softw
CVE-2025-20239 8.6 HIGH Cisco多款产品 安全漏洞
CVE-2025-20217 8.6 HIGH Cisco Firepower Threat Defense Intrusion Detection Denial of Service Vulnerability
CVE-2025-20222 8.6 HIGH Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Buffer V
CVE-2025-20148 8.5 HIGH Cisco Secure Firewall Management Center HTML Injection Vulnerability
CVE-2025-20251 8.5 HIGH Cisco Secure Firewall Adaptive Security Appliance and Cisco Secure Firewall Threat Defense
CVE-2025-20127 7.7 HIGH Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software for Firep
CVE-2025-20301 6.5 MEDIUM Cisco Secure Firewall Management Center Software Authorization Bypass Vulnerability
CVE-2025-20235 6.1 MEDIUM Cisco Secure Firewall Management Center Software Cross-Site Scripting Vulnerability
CVE-2025-20238 6.0 MEDIUM Cisco Secure Firewall Adaptive Security Appliance和Cisco Secure Firewall Threat Defense 安全漏
CVE-2025-20220 6.0 MEDIUM Cisco Secure Firewall Management Center和Cisco Secure Firewall Threat Defense 操作系统命令注入漏洞
CVE-2025-20237 6.0 MEDIUM Cisco Secure Firewall Adaptive Security Appliance和Cisco Secure Firewall Threat Defense 安全漏
CVE-2025-20225 5.8 MEDIUM Cisco多款产品 安全漏洞
CVE-2025-20224 5.8 MEDIUM Cisco Secure Firewall Adaptive Security Appliance和Cisco Secure Firewall Threat Defense 安全漏

Showing top 20 of 29 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Cisco Adaptive Security Appliance (ASA) Software
Same vendor: Cisco
Same weakness: CWE-1287

V. Comments for CVE-2025-20244

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