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CVE-2026-20004

Quick assessment

Affected
Cisco Cisco IOS XE 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 IOS XE Software是美国思科（Cisco）公司的一种网络操作系统。 Cisco IOS XE Software存在安全漏洞，该漏洞源于TLS连接建立期间内存资源管理不当，可能导致内存耗尽并引发拒绝服务。

CVSS 7.4 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1499.002 · Service Exhaustion Flood
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I. Basic Information for CVE-2026-20004

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the TLS library of Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to exhaust the available memory of an affected device. This vulnerability is due to improper management of memory resources during TLS connection setup. An attacker could exploit this vulnerability by repeatedly triggering the conditions that cause the memory increase. This could be done in a variety of ways, such as by repeatedly attempting Extensible Authentication Protocol (EAP) authentication when local EAP is enabled on an affected device or by using a machine-in-the-middle attack and resetting TLS connections between the affected device and other devices. A successful exploit could allow the attacker to exhaust the available memory on an affected device, resulting in an unexpected reload and a denial of service (DoS) condition.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对活跃已分配资源丧失索引
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco IOS XE Software 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco IOS XE Software是美国思科（Cisco）公司的一种网络操作系统。 Cisco IOS XE Software存在安全漏洞，该漏洞源于TLS连接建立期间内存资源管理不当，可能导致内存耗尽并引发拒绝服务。
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 IOS XE Software 16.9.1 -

II. Public POCs for CVE-2026-20004

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III. Intelligence Information for CVE-2026-20004

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Vendor Advisories for CVE-2026-20004 (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-2026-20012 8.6 HIGH Cisco多款产品 安全漏洞
CVE-2026-20125 7.7 HIGH Cisco IOS和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: Cisco IOS XE Software
Same vendor: Cisco
Same weakness: CWE-771

V. Comments for CVE-2026-20004

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