CVE-2023-1973: Undertow: unrestricted request storage leads to memory exhaustion

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-11-07 · updated 2026-06-17
Weakness: CWE-20

Description

A flaw was found in Undertow package. Using the FormAuthenticationMechanism, a malicious user could trigger a Denial of Service by sending crafted requests, leading the server to an OutofMemory error, exhausting the server's memory.

Affected products

Red Hat JBoss Enterprise Application Platform 7.4 for RHEL 8: all versions — fixed in 0:2.2.30-1.SP1_redhat_00001.1.el8eap
Red Hat JBoss Enterprise Application Platform 7.4 for RHEL 9: all versions — fixed in 0:2.2.30-1.SP1_redhat_00001.1.el9eap
Red Hat JBoss Enterprise Application Platform 7.4 on RHEL 7: all versions — fixed in 0:2.2.30-1.SP1_redhat_00001.1.el7eap
Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8: all versions — fixed in 0:2.3.11-1.SP1_redhat_00001.1.el8eap
Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9: all versions — fixed in 0:2.3.11-1.SP1_redhat_00001.1.el9eap

How to fix

Upgrade to a fixed version: Red Hat JBoss Enterprise Application Platform 7.4 for RHEL 8 0:2.2.30-1.SP1_redhat_00001.1.el8eap; Red Hat JBoss Enterprise Application Platform 7.4 for RHEL 9 0:2.2.30-1.SP1_redhat_00001.1.el9eap; Red Hat JBoss Enterprise Application Platform 7.4 on RHEL 7 0:2.2.30-1.SP1_redhat_00001.1.el7eap; Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 0:2.3.11-1.SP1_redhat_00001.1.el8eap; Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 0:2.3.11-1.SP1_redhat_00001.1.el9eap. Check the vendor advisory for mitigations.

References

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