CVE-2021-20147

Name: CVE-2021-20147
Creator: NVD / NIST
Published: 2022-01-03T22:15:08.503+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 6.90%

Last modified Jun 17, 2026

CVE-2021-20147 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. ManageEngine ADSelfService Plus below build 6116 contains an observable response discrepancy in the UMCP operation of the ChangePasswordAPI. This allows an unauthenticated remote attacker to determine whether a Windows domain user exists.. EPSS estimates a 6.90% chance of exploitation in the next 30 days.

Description

ManageEngine ADSelfService Plus below build 6116 contains an observable response discrepancy in the UMCP operation of the ChangePasswordAPI. This allows an unauthenticated remote attacker to determine whether a Windows domain user exists.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

6.90%

93.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-203

Affected Software

Vendor	Product	Versions
Zohocorp	Manageengine Adselfservice Plus	<= 6.0
Zohocorp	Manageengine Adselfservice Plus	6.1

References

https://www.tenable.com/security/research/tra-2021-52Exploit, Third Party Advisory
https://www.tenable.com/security/research/tra-2021-52Exploit, Third Party Advisory

Timeline

Published: Jan 3, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20147?

How severe is CVE-2021-20147?

CVE-2021-20147 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 6.90% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20147?

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-2021-20147?

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

Scan your code now

Source: NVD / NIST