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Security Bulletin: Denial of service vulnerability in WebSphere Application Server Liberty (CVE-2020-4590)

Security Bulletin


WebSphere Application Server Liberty is vulnerable to a denial of service. This has been addressed.

Vulnerability Details

CVEID:   CVE-2020-4590
DESCRIPTION:   IBM WebSphere Application Server Liberty running oauth-2.0 or openidConnectServer-1.0 server features is vulnerable to a denial of service attack conducted by an authenticated client.
CVSS Base score: 5.3
CVSS Temporal Score: See: for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H)

Affected Products and Versions

Affected Product(s)Version(s)
WebSphere Application Server Liberty17.0.0.3 -


The recommended solution is to apply the interim fix or Fix Pack containing APAR PH29368 for each named product as soon as practical.

For WebSphere Application Server Liberty - using the oauth-2.0 or openidConnectServer-1.0 features: 
· Upgrade to minimal fix pack levels as required by interim fix and then apply Interim Fix PH29368
· Apply Liberty Fix Pack or later (targeted availability 4Q2020).

Additional interim fixes may be available and linked off the interim fix download page.

Workarounds and Mitigations


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Change History

16 Sept 2020: Initial Publication

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.


Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

Document Location


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Document Information

Modified date:
16 September 2020