CVE-2021-20440

Name: CVE-2021-20440
Creator: NVD / NIST
Published: 2021-03-15T16:15:13.217+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.69%

Last modified Jun 17, 2026

CVE-2021-20440 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. IBM API Connect 10.0.0.0, and 2018.4.1.0 through 2018.4.1.13 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. EPSS estimates a 0.69% chance of exploitation in the next 30 days.

Description

IBM API Connect 10.0.0.0, and 2018.4.1.0 through 2018.4.1.13 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. IBM X-Force ID: 196536.

Metrics

CVSS 3.1

4.3/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS Probability

0.69%

48.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Ibm	Api Connect	>= 2018.4.1.0, <= 2018.4.1.13
Ibm	Api Connect	10.0.0.0

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/196536VDB Entry, Vendor Advisory
https://www.ibm.com/support/pages/node/6430107Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/196536VDB Entry, Vendor Advisory
https://www.ibm.com/support/pages/node/6430107Vendor Advisory

Timeline

Published: Mar 15, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20440?

How severe is CVE-2021-20440?

CVE-2021-20440 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.69% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20440?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20440?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST