IBM Support

Security Bulletin: IBM API Connect's API Manager is vulnerable to invitation and registration link tampering (CVE-2021-20440)

Security Bulletin


IBM API Connect has addressed the following vulnerability.

Vulnerability Details

CVEID:   CVE-2021-20440
DESCRIPTION:   IBM API Manager does not restrict member registration to the intended recepient. An attacker who is a valid user in the user registry used by API Manager can use a stolen invitation link and register themselves as a member of an API provider organization.
CVSS Base score: 6.4
CVSS Temporal Score: See: for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L)

Affected Products and Versions

Affected Product(s)Version(s)
API ConnectAPI Connect V10.0.0
API ConnectV2018.4.1.0-2018.4.1.13


Affected ProductAddressed in VRMFAPARRemediation/First Fix
IBM API Connect 


Addressed in IBM API Connect V2018.4.1.15.

Management server is impacted.

Follow this link and find the "management" package.
IBM API Connect 


Addressed in IBM API Connect V10.0.1.0.

Management server is impacted.

Follow this link and find the "management" package.

Workarounds and Mitigations


Get Notified about Future Security Bulletins



Change History

14 Mar 2021: 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.


According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.

Document Location


[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSMNED","label":"IBM API Connect"},"Component":"","Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":", 2018.4.1.0-2018.4.1.13","Edition":"","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
14 March 2021