CVE-2021-4253

Name: CVE-2021-4253
Creator: NVD / NIST
Published: 2022-12-18T22:15:10.317+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.39%

Last modified Jun 17, 2026

CVE-2021-4253 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. A vulnerability, which was classified as problematic, was found in ctrlo lenio. Affected is an unknown function in the library lib/Lenio.pm of the component Ticket Handler. EPSS estimates a 0.39% chance of exploitation in the next 30 days.

Description

A vulnerability, which was classified as problematic, was found in ctrlo lenio. Affected is an unknown function in the library lib/Lenio.pm of the component Ticket Handler. The manipulation of the argument site_id leads to cross site scripting. It is possible to launch the attack remotely. The name of the patch is 7a1f90bd2a0ce95b8338ec0926902da975ec64d9. It is recommended to apply a patch to fix this issue. VDB-216210 is the identifier assigned to this vulnerability.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

0.39%

30.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-707

Affected Software

Vendor	Product	Versions
Ctrlo	Lenio	< 2021-02-09

References

https://github.com/ctrlo/lenio/commit/7a1f90bd2a0ce95b8338ec0926902da975ec64d9Patch, Third Party Advisory
https://vuldb.com/?id.216210Permissions Required, Third Party Advisory
https://github.com/ctrlo/lenio/commit/7a1f90bd2a0ce95b8338ec0926902da975ec64d9Patch, Third Party Advisory
https://vuldb.com/?id.216210Permissions Required, Third Party Advisory

Timeline

Published: Dec 18, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4253?

How severe is CVE-2021-4253?

CVE-2021-4253 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.39% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4253?

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-2021-4253?

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

Scan your code now

Source: NVD / NIST