What’s Vulnerable › Vulnerabilities

CVE-2020-27782

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-02-23 · updated 2026-06-17
• Weakness: CWE-400

Description

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

• RedHat Jboss Fuse: 6.0.0, 7.0.0
• RedHat Openshift Application Runtimes: all versions
• Red Hat undertow: 2.0.33-sp2, 2.1.5-sp1, 2.2.3-sp1

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1901304
• https://bugzilla.redhat.com/show_bug.cgi?id=1901304

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