What is CVE-2021-45891?

CVE-2021-45891 is a high-severity vulnerability in Zauner Arc, classified under Incorrect Resource Transfer Between Spheres. CVSS score: 8.8/10. Published 2022-04-05.

How severe is CVE-2021-45891?

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

Vulnerability in Zauner Arc

CVE-2021-45891

An issue was discovered in Softwarebuero Zauner ARC 4.2.0.4., that allows attackers to escalate privileges within the application, since all permission checks are done client-side, not server-side.

Published 2022-04-05 · 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: 0.014 (71.8th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 71.8% 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

Zauner Arc — versions 4.2.0.4

Weakness classification (CWE)

CWE-669 — Incorrect Resource Transfer Between Spheres

References

syss.de (Third Party Advisory)
www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2021-063.txt (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-45891?: CVE-2021-45891 is a high-severity vulnerability in Zauner Arc, classified under Incorrect Resource Transfer Between Spheres. CVSS score: 8.8/10. Published 2022-04-05.
How severe is CVE-2021-45891?: High severity. CVSS v3 base score is 8.8 out of 10.