What’s Vulnerable › Vulnerabilities

CVE-2021-42090

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-10-07 · updated 2026-06-17
• Weakness: CWE-502

Description

An issue was discovered in Zammad before 4.1.1. The Form functionality allows remote code execution because deserialization is mishandled.

Affected products

• zammad: before 4.1.1 — fixed in 4.1.1

How to fix

Upgrade to a fixed version: zammad 4.1.1. Check the vendor advisory for mitigations.

References

• https://zammad.com/en/advisories/zaa-2021-14
• https://zammad.com/en/advisories/zaa-2021-14

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