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CVE-2026-20199

Quick assessment

Affected
Cisco Cisco ThousandEyes Enterprise Agent
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 ThousandEyes Virtual Appliance是美国思科（Cisco）公司的一款提供网络路径监测与数字体验可观测能力的虚拟化网络监控设备。 Cisco ThousandEyes Virtual Appliance存在注入漏洞，该漏洞源于SSL证书处理中用户输入验证不足，可能导致认证远程攻击者以root用户身份执行命令。

CVSS 4.7 · Medium EPSS 0.44% · P36

Affected Version Matrix 1

VendorProduct Version RangeStatus
Cisco Cisco ThousandEyes Enterprise Agent N/A affected
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I. Basic Information for CVE-2026-20199

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the SSL certificate handling of Cisco ThousandEyes Virtual Appliance could allow an authenticated, remote attacker to execute commands on the underlying operating system as the root user. This vulnerability is due to insufficient validation of user-supplied input. An authenticated attacker could exploit this vulnerability by uploading a crafted certificate to an affected device. A successful exploit could allow the attacker to execute arbitrary code as the root user on the underlying operating system. To exploit this vulnerability, the attacker must have valid administrative credentials.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
输出中的特殊元素转义处理不恰当(注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco ThousandEyes Virtual Appliance 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco ThousandEyes Virtual Appliance是美国思科（Cisco）公司的一款提供网络路径监测与数字体验可观测能力的虚拟化网络监控设备。 Cisco ThousandEyes Virtual Appliance存在注入漏洞，该漏洞源于SSL证书处理中用户输入验证不足，可能导致认证远程攻击者以root用户身份执行命令。
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

Vendor Product Affected Versions CPE Subscribe
Cisco Cisco ThousandEyes Enterprise Agent N/A -

II. Public POCs for CVE-2026-20199

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III. Intelligence Information for CVE-2026-20199

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Vendor Advisories for CVE-2026-20199 (1)

Same Patch Batch · Cisco · 2026-05-20 · 4 CVEs total

CVE-2026-20223 10.0 CRITICAL Cisco Secure Workload Unauthorized API Access Vulnerability
CVE-2026-20171 6.8 MEDIUM Cisco Nexus 3000 and 9000 Series Border Gateway Protocol Denial of Service Vulnerability
CVE-2026-20206 6.3 MEDIUM Cisco ThousandEyes BrowserBot Command Injection Vulnerability

IV. Related Vulnerabilities

Same product: Cisco ThousandEyes Enterprise Agent
Same vendor: Cisco
Same weakness: CWE-74

V. Comments for CVE-2026-20199

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