CVE-2020-4821

Name: CVE-2020-4821
Creator: NVD / NIST
Published: 2021-07-16T17:15:11.993+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.00%

Last modified Jun 17, 2026

CVE-2020-4821 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. IBM InfoSphere Data Replication 11.4 and IBM InfoSphere Change Data Capture for z/OS 10.2.1, under certain configurations, could allow a user to bypass authentication mechanisms using an empty password string. IBM X-Force ID: 189834. EPSS estimates a 2.00% chance of exploitation in the next 30 days.

Description

IBM InfoSphere Data Replication 11.4 and IBM InfoSphere Change Data Capture for z/OS 10.2.1, under certain configurations, could allow a user to bypass authentication mechanisms using an empty password string. IBM X-Force ID: 189834

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

2.00%

78.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions
Ibm	Infosphere Data Replication	11.4
Ibm	Infosphere Data Replication	11.4.0
Ibm	Infosphere Change Data Capture	10.2.1
Ibm	Infosphere Change Data Capture	11.3.3
Ibm	Infosphere Change Data Capture	11.4

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/189834VDB Entry, Vendor Advisory
https://www.ibm.com/support/pages/node/6472909Patch, Vendor Advisory
https://www.ibm.com/support/pages/node/6472911Patch, Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/189834VDB Entry, Vendor Advisory
https://www.ibm.com/support/pages/node/6472909Patch, Vendor Advisory
https://www.ibm.com/support/pages/node/6472911Patch, Vendor Advisory

Timeline

Published: Jul 16, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-4821?

How severe is CVE-2020-4821?

CVE-2020-4821 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.00% probability of exploitation in the next 30 days.

How do I fix CVE-2020-4821?

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-2020-4821?

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

Scan your code now

Source: NVD / NIST