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CVE-2025-20239

Quick assessment

Affected
Cisco IOS
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 IOS等都是美国思科（Cisco）公司的产品。Cisco IOS是一套为其网络设备开发的操作系统。Cisco IOS XE是一个操作系统。Cisco Secure Firewall Adaptive Security Appliance是一个企业级防火墙软件。 Cisco多款产品存在安全漏洞，该漏洞源于IKEv2数据包处理不当，可能导致内存泄漏和拒绝服务攻击。以下产品受到影响：Cisco IOS Software、IOS XE Software、Secure Firewall Adaptive

CVSS 8.6 · High EPSS 0.62% · P48

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-20239

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the Internet Key Exchange Version 2 (IKEv2) feature of Cisco IOS Software, IOS XE Software, Secure Firewall Adaptive Security Appliance (ASA) Software, and Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a memory leak, resulting in a denial of service (DoS) condition. This vulnerability is due to a lack of proper processing of IKEv2 packets. An attacker could exploit this vulnerability by sending crafted IKEv2 packets to an affected device. In the case of Cisco IOS and IOS XE Software, a successful exploit could allow the attacker to cause the device to reload unexpectedly. In the case of Cisco ASA and FTD Software, a successful exploit could allow the attacker to partially exhaust system memory, causing system instability such as being unable to establish new IKEv2 VPN sessions. A manual reboot of the device is required to recover from this condition.
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
在移除最后引用时对内存的释放不恰当(内存泄露)
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco多款产品 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco IOS等都是美国思科（Cisco）公司的产品。Cisco IOS是一套为其网络设备开发的操作系统。Cisco IOS XE是一个操作系统。Cisco Secure Firewall Adaptive Security Appliance是一个企业级防火墙软件。 Cisco多款产品存在安全漏洞，该漏洞源于IKEv2数据包处理不当，可能导致内存泄漏和拒绝服务攻击。以下产品受到影响：Cisco IOS Software、IOS XE Software、Secure Firewall Adaptive
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 IOS 15.2(4)E -
Cisco Cisco Adaptive Security Appliance (ASA) Software 9.8.1 -
Cisco Cisco IOS XE Software 3.14.0S -
Cisco Cisco Firepower Threat Defense Software 6.2.3 -

II. Public POCs for CVE-2025-20239

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III. Intelligence Information for CVE-2025-20239

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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-2025-20217 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-2025-20244 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-2025-20238 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: IOS
Same vendor: Cisco
Same weakness: CWE-401

V. Comments for CVE-2025-20239

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