What is CVE-2021-31859?

CVE-2021-31859 is a high-severity vulnerability in Ysoft Safeq, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 7.8/10. Published 2021-07-14.

How severe is CVE-2021-31859?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Ysoft Safeq

CVE-2021-31859

Incorrect privileges in the MU55 FlexiSpooler service in YSoft SafeQ 6 6.0.55 allows local user privilege escalation by overwriting the executable file via an alternative data stream.

Published 2021-07-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (24.2th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 24.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Ysoft Safeq — versions 6.0.55

Weakness classification (CWE)

CWE-732 — Incorrect Permission Assignment for Critical Resource

References

www.ysoft.com/en (Vendor Advisory)
www.ysoft.com/en/legal/ysoft-safeq-flexispooler (Vendor Advisory)

Frequently asked questions

What is CVE-2021-31859?: CVE-2021-31859 is a high-severity vulnerability in Ysoft Safeq, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 7.8/10. Published 2021-07-14.
How severe is CVE-2021-31859?: High severity. CVSS v3 base score is 7.8 out of 10.