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CVE-2026-20012

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 Secure Firewall Adaptive Security Appliance是一个企业级防火墙软件。Cisco IOS XE Software是一种网络操作系统。 Cisco多款产品存在安全漏洞，该漏洞源于IKEv2数据包解析不当，可能导致内存泄漏并引发拒绝服务。以下产品受到影响：Cisco IOS Software、Cisco IOS XE Software、Cisco S

CVSS 8.6 · High EPSS 0.35% · P27

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service
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I. Basic Information for CVE-2026-20012

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, Cisco IOS XE Software, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, and Cisco 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 on an affected device. This vulnerability is due to improper parsing of IKEv2 packets. An attacker could exploit this vulnerability by sending crafted IKEv2 packets to an affected device. A successful exploit of Cisco IOS Software and IOS XE Software could allow the attacker to cause the affected device to reload, resulting in a DoS condition. A successful exploit of Cisco Secure Firewall ASA Software and Secure FTD Software could allow the attacker to partially exhaust system memory, resulting in system instability, such as the inability 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 Secure Firewall Adaptive Security Appliance是一个企业级防火墙软件。Cisco IOS XE Software是一种网络操作系统。 Cisco多款产品存在安全漏洞，该漏洞源于IKEv2数据包解析不当，可能导致内存泄漏并引发拒绝服务。以下产品受到影响：Cisco IOS Software、Cisco IOS XE Software、Cisco S
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(1)S -
Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.8.1 -
Cisco Cisco IOS XE Software 3.5.0E -
Cisco Cisco Secure Firewall Threat Defense (FTD) Software 6.2.3 -

II. Public POCs for CVE-2026-20012

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III. Intelligence Information for CVE-2026-20012

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Vendor Advisories for CVE-2026-20012 (1)

Same Patch Batch · Cisco · 2026-03-25 · 13 CVEs total

CVE-2026-20084 8.6 HIGH Cisco IOS XE Software 资源管理错误漏洞
CVE-2026-20086 8.6 HIGH Cisco IOS XE Wireless Controller software 安全漏洞
CVE-2026-20125 7.7 HIGH Cisco IOS和Cisco IOS XE Software 安全漏洞
CVE-2026-20004 7.4 HIGH Cisco IOS XE Software 安全漏洞
CVE-2026-20110 6.5 MEDIUM Cisco IOS XE Software 安全漏洞
CVE-2026-20083 6.5 MEDIUM Cisco IOS XE Software 安全漏洞
CVE-2026-20104 6.1 MEDIUM Cisco多款产品 安全漏洞
CVE-2026-20115 6.1 MEDIUM Cisco IOS XE Software 安全漏洞
CVE-2026-20114 5.4 MEDIUM Cisco IOS XE Software 安全漏洞
CVE-2026-20108 5.4 MEDIUM Cisco Catalyst SD-WAN Manager（Cisco SD-WAN vManage） 跨站脚本漏洞
CVE-2026-20113 5.3 MEDIUM Cisco IOS XE Software 注入漏洞
CVE-2026-20112 4.8 MEDIUM Cisco IOS XE Software 跨站脚本漏洞

IV. Related Vulnerabilities

Same product: IOS
Same vendor: Cisco
Same weakness: CWE-401

V. Comments for CVE-2026-20012

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