CVE-2026-20199
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. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-tevacert-rce-RMJVEym5 Security Impact Rating: Medium CVE: CVE-2026-20199
CSIRTS triage
- What
- A vulnerability in SSL certificate handling could allow an authenticated attacker to execute commands as the root user.
- Who is affected
- Authenticated administrators of Cisco ThousandEyes Virtual Appliance.
- Urgency
- Remediation is medium urgency as exploitation requires administrative credentials and could lead to arbitrary code execution.
- Action
- Cisco has released software updates that address this vulnerability.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.44% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 35% of all EPSS-scored CVEs.
Advisory coverage (1)
- mediumCisco ThousandEyes Virtual Appliance Authenticated Remote Code Execution Vulnerabilitycisco-psirt · 2026-05-20
External references
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