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CVE-2026-20004

CVSS 7.4 · High EPSS 0.06% · P18
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I. Basic Information for CVE-2026-20004

Vulnerability Information
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Vulnerability Title
N/A
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
对活跃已分配资源丧失索引
Source: NVD (National Vulnerability Database)
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

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

CVE-2026-200848.6 HIGHCisco IOS XE Software 资源管理错误漏洞
CVE-2026-200868.6 HIGHCisco IOS XE Wireless Controller software 安全漏洞
CVE-2026-200128.6 HIGHCisco多款产品 安全漏洞
CVE-2026-201257.7 HIGHCisco IOS和Cisco IOS XE Software 安全漏洞
CVE-2026-201106.5 MEDIUMCisco IOS XE Software 安全漏洞
CVE-2026-200836.5 MEDIUMCisco IOS XE Software 安全漏洞
CVE-2026-201046.1 MEDIUMCisco多款产品 安全漏洞
CVE-2026-201156.1 MEDIUMCisco IOS XE Software 安全漏洞
CVE-2026-201145.4 MEDIUMCisco IOS XE Software 安全漏洞
CVE-2026-201085.4 MEDIUMCisco Catalyst SD-WAN Manager（Cisco SD-WAN vManage） 跨站脚本漏洞
CVE-2026-201135.3 MEDIUMCisco IOS XE Software 注入漏洞
CVE-2026-201124.8 MEDIUMCisco 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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