What is CVE-2021-37417?

CVE-2021-37417 is a critical-severity vulnerability in Zohocorp Manageengine Adselfservice Plus, classified under Improper Authentication. CVSS score: 9.8/10. Published 2021-08-30.

How severe is CVE-2021-37417?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-37417 known to be exploited?

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

Auth bypass in Zohocorp Manageengine Adselfservice Plus

CVE-2021-37417

Zoho ManageEngine ADSelfService Plus version 6103 and prior allows CAPTCHA bypass due to improper parameter validation.

Vulnerability class: Broken Authentication

Published 2021-08-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.048 (91.6th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 91.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.048 · newest: 0.048 · change: 0.000

Affected products

Zohocorp Manageengine Adselfservice Plus — versions 6.1

Weakness classification (CWE)

CWE-287 — Improper Authentication

Public proof-of-concept exploits

References

blog.stmcyber.com/vulns/cve-2021-37417/ (Third Party Advisory, Release Notes)

Frequently asked questions

What is CVE-2021-37417?: CVE-2021-37417 is a critical-severity vulnerability in Zohocorp Manageengine Adselfservice Plus, classified under Improper Authentication. CVSS score: 9.8/10. Published 2021-08-30.
How severe is CVE-2021-37417?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-37417 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.