CVE-2024-4027
January 30, 2026
A flaw was found in Undertow. Servlets using a method that calls HttpServletRequestImpl.getParameterNames() can cause an OutOfMemoryError when the client sends a request with large parameter names. This issue can be exploited by an unauthorized user to cause a remote denial-of-service (DoS) attack.
Affected Packages
https://github.com/undertow-io/undertow.git (GITHUB):
Affected version(s) >=1.0.0.Alpha1 <2.3.21.FinalFix Suggestion:
Update to version 2.3.21.Finalhttps://github.com/undertow-io/undertow.git (GITHUB):
Affected version(s) =2.4.0.Alpha1 <2.4.0.Beta1Fix Suggestion:
Update to version 2.4.0.Beta1io.undertow:undertow-core (JAVA):
Affected version(s) >=1.0.0.Alpha1 <2.2.39.FinalFix Suggestion:
Update to version 2.2.39.Finalio.undertow:undertow-core (JAVA):
Affected version(s) =2.4.0.Alpha1 <2.4.0.Beta1Fix Suggestion:
Update to version 2.4.0.Beta1io.undertow:undertow-core (JAVA):
Affected version(s) >=2.3.0.Alpha1 <2.3.21.FinalFix Suggestion:
Update to version 2.3.21.FinalRelated Resources (15)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
EPSS
Base Score:
0.35
