CVE-2025-36047

IBM WebSphere Application Server Liberty denial of service

Description

IBM WebSphere Application Server Liberty 18.0.0.2 through 25.0.0.8 is vulnerable to a denial of service, caused by sending a specially-crafted request. A remote attacker could exploit this vulnerability to cause the server to consume memory resources.

Remediation

Solution:

  • IBM strongly recommends addressing the vulnerability now by applying a currently available interim fix or fix pack that contains the fix for APAR PH66953. To determine if a feature is enabled for IBM WebSphere Application Server Liberty, refer to How to determine if Liberty is using a specific feature. To determine if the HTTP/2 protocol is enabled with Liberty Servlet features see HTTP/2 Support for Liberty. For IBM WebSphere Application Server Liberty 18.0.0.2 - 25.0.0.8 using the servlet-3.1, servlet-4.0, servlet-5.0, or servlet-6.0 feature(s) with the HTTP/2 protocol enabled: · Upgrade to minimal fix pack levels as required by the interim fix and then apply the Interim Fix that resolves PH66953 --OR-- · Apply Liberty Fix Pack 25.0.0.9 or later (targeted availability 3Q2025). Additional interim fixes may be available and linked off the interim fix download page.

Category

5.3
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.08%
Vendor Advisory ibm.com
Affected: IBM WebSphere Application Server Liberty
Published at:
Updated at:

References

Link Tags
https://www.ibm.com/support/pages/node/7242086 patch vendor advisory

Frequently Asked Questions

What is the severity of CVE-2025-36047?
CVE-2025-36047 has been scored as a medium severity vulnerability.
How to fix CVE-2025-36047?
To fix CVE-2025-36047: IBM strongly recommends addressing the vulnerability now by applying a currently available interim fix or fix pack that contains the fix for APAR PH66953. To determine if a feature is enabled for IBM WebSphere Application Server Liberty, refer to How to determine if Liberty is using a specific feature. To determine if the HTTP/2 protocol is enabled with Liberty Servlet features see HTTP/2 Support for Liberty. For IBM WebSphere Application Server Liberty 18.0.0.2 - 25.0.0.8 using the servlet-3.1, servlet-4.0, servlet-5.0, or servlet-6.0 feature(s) with the HTTP/2 protocol enabled: · Upgrade to minimal fix pack levels as required by the interim fix and then apply the Interim Fix that resolves PH66953 --OR-- · Apply Liberty Fix Pack 25.0.0.9 or later (targeted availability 3Q2025). Additional interim fixes may be available and linked off the interim fix download page.
Is CVE-2025-36047 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-36047 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-36047?
CVE-2025-36047 affects IBM WebSphere Application Server Liberty.
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