CVE-2021-37421

CRITICALNVD 9.89.8—

9.8

Zoho ManageEngine ADSelfService Plus 6103 and prior is vulnerable to admin portal access-restriction bypass.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 92.3%
KEV: Not listed

Published

August 30, 2021

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Jun 3, 2026

🔬 Proof of concept available. No patch confirmed yet.

generic

https://pitstop.manageengine.com/portal/en/community/topic/adselfservice-plus-6104-released-with-an-important-security-fixes

generic🟡 PoC Available

CVE-2021-37421 - STM Cyber Blog

https://blog.stmcyber.com/vulns/cve-2021-37421/

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 19× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 11:16 UTCEG score recompute
2026-05-26 11:16 UTCGHSA enrichment
2026-05-24 19:42 UTCOSV refresh

Frequently asked(5)

What is CVE-2021-37421?

CVE-2021-37421 is a critical vulnerability published on August 30, 2021. Zoho ManageEngine ADSelfService Plus 6103 and prior is vulnerable to admin portal access-restriction bypass.

When was CVE-2021-37421 disclosed?

CVE-2021-37421 was first published in the National Vulnerability Database on August 30, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-37421 actively exploited?

CVE-2021-37421 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 92.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-37421?

CVE-2021-37421 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2021-37421?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-37421, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-37421

📅 Published

🔄 Last Modified

📋 Advisory Details (2)

CVE-2021-37421 - STM Cyber Blog

Weakness Classification(2)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-37421?

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Advisory Details (2)

Frequently asked(5)

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