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CVE-2021-1531: Cisco Modeling Labs Web UI Command Injection Vulnerability

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 30.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-05-22 · updated 2026-06-17
• Weakness: CWE-88

Description

A vulnerability in the web UI of Cisco Modeling Labs could allow an authenticated, remote attacker to execute arbitrary commands with the privileges of the web application on the underlying operating system of an affected Cisco Modeling Labs server. This vulnerability is due to insufficient validation of user-supplied input to the web UI. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected server. A successful exploit could allow the attacker to execute arbitrary commands with the privileges of the web application, virl2, on the underlying operating system of the affected server. To exploit this vulnerability, the attacker must have valid user credentials on the web UI.

Affected products

• Cisco Modeling Labs: 2.0.0, 2.0.1, 2.1.0, 2.1.1, 2.1.2, 2.1.3

References

• http://packetstormsecurity.com/files/163265/Cisco-Modeling-Labs-2.1.1-b19-Remote-Command-Execution.html
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cml-cmd-inject-N4VYeQXB
• http://packetstormsecurity.com/files/163265/Cisco-Modeling-Labs-2.1.1-b19-Remote-Command-Execution.html
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cml-cmd-inject-N4VYeQXB

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