What is CVE-2021-20147?

CVE-2021-20147 is a medium-severity vulnerability in Zohocorp Manageengine Adselfservice Plus, classified under Observable Discrepancy. CVSS score: 5.3/10. Published 2022-01-03.

How severe is CVE-2021-20147?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Is CVE-2021-20147 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Zohocorp Manageengine Adselfservice Plus

CVE-2021-20147

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.

Published 2022-01-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.069 (93.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 93.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.069 · newest: 0.069 · change: 0.000

Affected products

Zohocorp Manageengine Adselfservice Plus — versions 6.1
Manageengine Adselfservice Plus — versions < 6116

Weakness classification (CWE)

CWE-203 — Observable Discrepancy

Public proof-of-concept exploits

References

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

Frequently asked questions

What is CVE-2021-20147?: CVE-2021-20147 is a medium-severity vulnerability in Zohocorp Manageengine Adselfservice Plus, classified under Observable Discrepancy. CVSS score: 5.3/10. Published 2022-01-03.
How severe is CVE-2021-20147?: Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2021-20147 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.