CVE-2021-42090 Deserialization in n/a

Critical 9.8 Published 7 Oct 2021 Updated 4 Aug 2024

Remote attackers can execute arbitrary code via unsafe deserialization in the Form functionality of Zammad.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-42090?

CVE-2021-42090 is a critical unsafe deserialization vulnerability in Zammad Zammad, published on 7 Oct 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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

Weakness: CWE-502

Which versions are affected by CVE-2021-42090?

It affects 1 product.

Products include Zammad Zammad.

How do I fix CVE-2021-42090?

No fix has been published for CVE-2021-42090 yet. Limit exposure of the affected software until one is available.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2021-42090 being exploited?

There is no known exploitation of CVE-2021-42090 in the wild and no public exploit code.

All Zammad Zammad vulnerabilities

Sources

Also known as GHSA-7qc3-f238-wf3x.