What is CVE-2021-4253?

CVE-2021-4253 is a low-severity vulnerability in Ctrlo Lenio, classified under CWE-707. CVSS score: 3.5/10. Published 2022-12-18.

How severe is CVE-2021-4253?

Low severity. CVSS v3 base score is 3.5 out of 10.

Vulnerability in Ctrlo Lenio

CVE-2021-4253

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.

Published 2022-12-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (32.1th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 32.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

Ctrlo Lenio

Weakness classification (CWE)

CWE-707

References

github.com/ctrlo/lenio/commit/7a1f90bd2a0ce95b8338ec0926902da975ec64d9 (Patch, Third Party Advisory)
vuldb.com/ (Permissions Required, Third Party Advisory)

Frequently asked questions

What is CVE-2021-4253?: CVE-2021-4253 is a low-severity vulnerability in Ctrlo Lenio, classified under CWE-707. CVSS score: 3.5/10. Published 2022-12-18.
How severe is CVE-2021-4253?: Low severity. CVSS v3 base score is 3.5 out of 10.