CVE-2018-4939 Adobe ColdFusion Deserialization of Untrusted Data

Exploited in the wild Critical 9.8 Published 19 May 2018 Updated 21 Oct 2025

An attacker can achieve arbitrary code execution by exploiting a deserialization vulnerability in Adobe ColdFusion.

Exploited in the wild: Since 3 Nov 2021
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2018-4939?

CVE-2018-4939 is a critical unsafe deserialization vulnerability in Adobe Coldfusion, published on 19 May 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Adobe ColdFusion Update 5 and earlier versions, ColdFusion 11 Update 13 and earlier versions have an exploitable Deserialization of Untrusted Data vulnerability. Successful exploitation could lead to arbitrary code execution.

Weakness: CWE-502

Which versions are affected by CVE-2018-4939?

It affects 1 product.

Products include Adobe Coldfusion.

How do I fix CVE-2018-4939?

No fix has been published for CVE-2018-4939 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 3 May 2022.

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

Is CVE-2018-4939 being exploited?

Yes. Attackers have exploited CVE-2018-4939 in the wild since at least 3 Nov 2021.

All Adobe Coldfusion vulnerabilities

Sources

Also known as GHSA-p86w-qv2x-rf6j.