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CVE-2026-20040— Cisco IOS XR Software CLI Privilege Escalation Vulnerability

CVSS 8.8 · High EPSS 0.05% · P14
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I. Basic Information for CVE-2026-20040

Vulnerability Information
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Vulnerability Title
Cisco IOS XR Software CLI Privilege Escalation Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
A vulnerability in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker to execute arbitrary commands as root on the underlying operating system of an affected device. This vulnerability is due to insufficient validation of user arguments that are passed to specific CLI commands. An attacker with a low-privileged account could exploit this vulnerability by using crafted commands at the prompt. A successful exploit could allow the attacker to elevate privileges to root and execute arbitrary commands on the underlying operating system.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Cisco IOS XR 操作系统命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco IOS XR是美国思科（Cisco）公司的一套为其网络设备开发的操作系统。 Cisco IOS XR存在操作系统命令注入漏洞，该漏洞源于对特定CLI命令中用户参数验证不足，可能导致权限提升和执行任意命令。
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 XR Software 6.5.3 -

II. Public POCs for CVE-2026-20040

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III. Intelligence Information for CVE-2026-20040

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Same Patch Batch · Cisco · 2026-03-11 · 6 CVEs total

CVE-2026-200468.8 HIGHCisco IOS XR Software CLI Privilege Escalation Vulnerability
CVE-2026-200747.4 HIGHCisco IOS XR Software Multi-Instance Intermediate System-to-Intermediate System Denial of
CVE-2026-201186.8 MEDIUMCisco IOS-XR NCS 5500 and NCS 5700 Egress Packet Network Interfaces Aligner Interrupt Deni
CVE-2026-201166.1 MEDIUMMultiple Cisco Contact Center Products Cross-Site Scripting Vulnerabilities
CVE-2026-201176.1 MEDIUMMultiple Cisco Contact Center Products Cross-Site Scripting Vulnerabilities

IV. Related Vulnerabilities

Same product: Cisco IOS XR Software
Same vendor: Cisco
Same weakness: CWE-78

V. Comments for CVE-2026-20040

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