What is CVE-2021-36231?

CVE-2021-36231 is a high-severity vulnerability in Unit4 Mik.starlight, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2021-08-31.

How severe is CVE-2021-36231?

High severity. CVSS v3 base score is 8.8 out of 10.

Deserialization in Unit4 Mik.starlight

CVE-2021-36231

Deserialization of untrusted data in multiple functions in MIK.starlight 7.9.5.24363 allows authenticated remote attackers to execute operating system commands by crafting serialized objects.

Vulnerability class: Insecure Deserialization

Published 2021-08-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.026 (84.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 84.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.026 · newest: 0.026 · change: 0.000

Affected products

Unit4 Mik.starlight — versions 7.9.5.24363

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2021-035.txt (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-36231?: CVE-2021-36231 is a high-severity vulnerability in Unit4 Mik.starlight, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2021-08-31.
How severe is CVE-2021-36231?: High severity. CVSS v3 base score is 8.8 out of 10.