CVE-2021-42090
An issue was discovered in Zammad before 4.1.1. The Form functionality allows remote code...
An issue was discovered in Zammad before 4.1.1. The Form functionality allows remote code execution because deserialization is mishandled.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
An issue was discovered in Zammad before 4.1.1. The Form functionality allows remote code execution because deserialization is mishandled.
- Record
CVE-2021-42090- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-502
- Updated
- 2026-11-02
CVE List No score
An issue was discovered in Zammad before 4.1.1. The Form functionality allows remote code execution because deserialization is mishandled.
- Record
CVE-2021-42090- Updated
- 2026-11-02
EUVDEUVD-2021-29076 No score
An issue was discovered in Zammad before 4.1.1. The Form functionality allows remote code execution because deserialization is mishandled.
- Record
EUVD-2021-29076- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-7qc3-f238-wf3x No score
An issue was discovered in Zammad before 4.1.1. The Form functionality allows remote code...
An issue was discovered in Zammad before 4.1.1. The Form functionality allows remote code execution because deserialization is mishandled.
- Record
GHSA-7qc3-f238-wf3x- Weakness
- CWE-502
- Updated
- 2026-11-02
OSV
An issue was discovered in Zammad before 4.1.1. The Form functionality allows remote code execution because deserialization is mishandled.
- Record
CVE-2021-42090- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-42090 is a critical vulnerability (CVSS 9.8) in Zammad, published October 7, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.33%, the 83rd percentile. No source names a fixed version.