What is CVE-2021-28023?

CVE-2021-28023 is a critical-severity vulnerability in Servicetonic, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2021-11-08.

How severe is CVE-2021-28023?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Arbitrary file upload in Servicetonic

CVE-2021-28023

Arbitrary file upload in Service import feature in ServiceTonic Helpdesk software version < 9.0.35937 allows a malicious user to execute JSP code by uploading a zip that extracts files in relative paths.

Vulnerability class: Unrestricted File Upload

Published 2021-11-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.014 (70.7th percentile), scored 2026-10-08.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 70.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Servicetonic

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

www.servicetonic.com/ (Product)
www.srlabs.de/bites/chaining-three-zero-day-exploits-in-itsm-software-serviceto… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-28023?: CVE-2021-28023 is a critical-severity vulnerability in Servicetonic, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2021-11-08.
How severe is CVE-2021-28023?: Critical severity. CVSS v3 base score is 9.8 out of 10.