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CVE-2025-20217— Cisco Firepower Threat Defense Intrusion Detection Denial of Service Vulnerability

Quick assessment

Affected
Cisco Cisco Firepower Threat Defense 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 Threat Defense是美国思科（Cisco）公司的一个集成式防火墙平台。 Cisco Secure Firewall Threat Defense存在安全漏洞，该漏洞源于流量处理不当，可能导致拒绝服务攻击。

CVSS 8.6 · High EPSS 0.72% · P52

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-20217

Vulnerability Information
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Vulnerability Title
Cisco Firepower Threat Defense Intrusion Detection Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the packet inspection functionality of the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to incorrect processing of traffic that is inspected by an affected device. An attacker could exploit this vulnerability by sending crafted traffic through the affected device. A successful exploit could allow the attacker to cause the affected device to enter an infinite loop while inspecting traffic, resulting in a DoS condition. The system watchdog will restart the Snort process automatically.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Secure Firewall Threat Defense 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Secure Firewall Threat Defense是美国思科（Cisco）公司的一个集成式防火墙平台。 Cisco Secure Firewall Threat Defense存在安全漏洞，该漏洞源于流量处理不当，可能导致拒绝服务攻击。
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 Firepower Threat Defense Software 7.1.0 -

II. Public POCs for CVE-2025-20217

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III. Intelligence Information for CVE-2025-20217

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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-2025-20222 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-2025-20244 7.7 HIGH Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Softw
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-2025-20237 6.0 MEDIUM Cisco Secure Firewall Adaptive Security Appliance和Cisco Secure Firewall Threat Defense 安全漏
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-2025-20225 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 Firepower Threat Defense Software
Same vendor: Cisco
Same weakness: CWE-835

V. Comments for CVE-2025-20217

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