Is CVE-2020-11066 actively exploited?

No active exploitation of CVE-2020-11066 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-11066 be exploited remotely?

Yes. CVE-2020-11066 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2020-11066?

CVE-2020-11066 has a CVSS score of 10.0 (CRITICAL).

HOME VULNERABILITIESCVE-2020-11066

CRITICAL

CVE-2020-11066

CWE-915Published: May 14, 2020· Updated: Jun 17, 2026

10.0

CVSS v3.1

Official Description

In TYPO3 CMS greater than or equal to 9.0.0 and less than 9.5.17 and greater than or equal to 10.0.0 and less than 10.4.2, calling unserialize() on malicious user-submitted content can lead to modification of dynamically-determined object attributes and result in triggering deletion of an arbitrary directory in the file system, if it is writable for the web server. It can also trigger message submission via email using the identity of the web site (mail relay). Another insecure deserialization vulnerability is required to actually exploit mentioned aspects. This has been fixed in 9.5.17 and 10.4.2.

NVD Source

Technical Analysis

CVE-2020-11066 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 10.0.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.