MEDIUM
CVE-2020-29159
NVD-CWE-noinfoPublished: December 28, 2020· Updated: Jun 17, 2026
4.9
CVSS v3.1
Official 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.
Technical Analysis
CVE-2020-29159 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 4.9.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.High
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Affected Vendors & Products
zammad1 product(s)
zammad
Source: NVD CPE · 1 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
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Rapid7 / Metasploit
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PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories
All References (4)
→
https://github.com/zammad/zammad/commit/f0462d4c20c2968b52b5dc6a585f26c0409b4fc4Patch · Third Party Advisory
→
https://zammad.com/en/advisories/zaa-2020-22Vendor Advisory
→
https://github.com/zammad/zammad/commit/f0462d4c20c2968b52b5dc6a585f26c0409b4fc4Patch · Third Party Advisory
→
https://zammad.com/en/advisories/zaa-2020-22Vendor Advisory
Quick Facts
CVE IDCVE-2020-29159
CVSS Score4.9 / 10
SeverityMEDIUM
WeaknessNVD-CWE-noinfo
CISA KEVNo
Affected1 vendor(s)
PublishedDec 28, 2020
Related CVEs (NVD-CWE-noinfo)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2020-29159 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.