CVE-2020-27782: Red Hat JBoss Fuse

High severity, CVSS 7.5. EPSS: 1.4% chance of exploitation in the next 30 days.

A flaw was found in the Undertow AJP connector. Malicious requests and abrupt connection closes could be triggered by an attacker using query strings with non-RFC compliant characters resulting in a denial of service. The highest threat from this vulnerability is to system availability. This affects Undertow 2.1.5.SP1, 2.0.33.SP2, and 2.2.3.SP1.

Affected products

• Red Hat JBoss Fuse: version 6.0.0 only; version 7.0.0 only
• Red Hat Openshift Application Runtimes: affected versions not specified
• Red Hat Undertow: version 2.0.33 only; version 2.1.5 only; version 2.2.3 only

Published 2021-02-23. Last modified 2026-06-17.