How severe is CVE-2020-29159?

CVE-2020-29159 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2020-29159 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-29159?

CVE-2020-29159 affects Zammad. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-29159?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-29159 published?

CVE-2020-29159 was published on 2020-12-28 and last updated on 2026-06-17.

CVE-2020-29159

CVE-2020-29159 is a medium-severity vulnerability in Zammad with a CVSS 3.x base score of 4.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 4.9)
CVSS v2: 4.0
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Zammad
Published: 2020-12-28
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2020-29159?: CVE-2020-29159 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2020-29159 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-29159?: CVE-2020-29159 affects Zammad. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-29159?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-29159 published?: CVE-2020-29159 was published on 2020-12-28 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:zammad:zammad:*:*:*:*:*:*:*:*

More vulnerabilities in Zammad

CVE-2022-48021 — Critical (CVSS 9.8): A vulnerability in Zammad v5.3.0 allows attackers to execute arbitrary code or escalate privileges via a crafted…
CVE-2022-35490 — Critical (CVSS 9.8): Zammad 5.2.0 is vulnerable to privilege escalation. Zammad has a prevention against brute-force attacks trying to guess…
CVE-2021-42090 — Critical (CVSS 9.8): An issue was discovered in Zammad before 4.1.1. The Form functionality allows remote code execution because…
CVE-2021-42094 — Critical (CVSS 9.8): An issue was discovered in Zammad before 4.1.1. Command Injection can occur via custom Packages.
CVE-2020-26030 — Critical (CVSS 9.8): An issue was discovered in Zammad before 3.4.1. There is an authentication bypass in the SSO endpoint via a crafted…
CVE-2017-6080 — Critical (CVSS 9.8): An issue was discovered in Zammad before 1.0.4, 1.1.x before 1.1.3, and 1.2.x before 1.2.1, caused by lack of a…

All CVEs affecting Zammad →