What is CVE-2020-29159?

CVE-2020-29159 is a medium-severity vulnerability in Zammad. CVSS score: 4.9/10. Published 2020-12-28.

How severe is CVE-2020-29159?

Medium severity. CVSS v3 base score is 4.9 out of 10.

Vulnerability in Zammad

CVE-2020-29159

An issue was discovered in Zammad before 3.5.1. The default signup Role (for newly created Users) can be a privileged Role, if configured by an admin. This behvaior was unintended.

Published 2020-12-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.009 (59.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: +0.000

Affected products

Zammad

References

zammad.com/en/advisories/zaa-2020-22 (Vendor Advisory)
github.com/zammad/zammad/commit/f0462d4c20c2968b52b5dc6a585f26c0409b4fc4 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2020-29159?: CVE-2020-29159 is a medium-severity vulnerability in Zammad. CVSS score: 4.9/10. Published 2020-12-28.
How severe is CVE-2020-29159?: Medium severity. CVSS v3 base score is 4.9 out of 10.