CVE-2021-1531

Name: CVE-2021-1531
Creator: NVD / NIST
Published: 2021-05-22T07:15:07.35+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 30.49%

Last modified Jun 17, 2026

CVE-2021-1531 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 30.49% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

30.49%

98.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-88

Affected Software

Vendor	Product	Versions
Cisco	Modeling Labs	2.0.0
Cisco	Modeling Labs	2.0.1
Cisco	Modeling Labs	2.1.0
Cisco	Modeling Labs	2.1.1
Cisco	Modeling Labs	2.1.2
Cisco	Modeling Labs	2.1.3

References

http://packetstormsecurity.com/files/163265/Cisco-Modeling-Labs-2.1.1-b19-Remote-Command-Execution.htmlExploit, Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cml-cmd-inject-N4VYeQXBVendor Advisory
http://packetstormsecurity.com/files/163265/Cisco-Modeling-Labs-2.1.1-b19-Remote-Command-Execution.htmlExploit, Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cml-cmd-inject-N4VYeQXBVendor Advisory

Timeline

Published: May 22, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-1531?

How severe is CVE-2021-1531?

CVE-2021-1531 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 30.49% probability of exploitation in the next 30 days.

How do I fix CVE-2021-1531?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-1531?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST