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CVE-2024-4027

Good to know:

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Date: 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.

Severity Score

Related Resources (8)

https://issues.redhat.com/browse/UNDERTOW-2377
https://access.redhat.com/security/cve/CVE-2024-4027
https://github.com/undertow-io/undertow
https://bugzilla.redhat.com/show_bug.cgi?id=2276410
https://github.com/undertow-io/undertow/commit/6b7c18481ce65ae4012d92fe2b7f17a21ef4d70b
https://nvd.nist.gov/vuln/detail/CVE-2024-4027
https://github.com/undertow-io/undertow/releases/tag/2.3.21.Final
https://www.mend.io/vulnerability-database/CVE-2024-4027

Severity Score

Weakness Type (CWE)

Improper Input Validation

CWE-20

Allocation of Resources Without Limits or Throttling

CWE-770

Top Fix

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Upgrade Version

Upgrade to version io.undertow:undertow-core:2.3.21.Final;io.undertow:undertow-core:2.2.39.Final;https://github.com/undertow-io/undertow.git - 2.3.21.Final

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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