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Tool Directory

CVE-2020-28653

CriticalPublished

Zoho ManageEngine OpManager Stable build before 125203 (and Released build before 125233) allows Remote Code Execution via the Smart Update Manager (SUM)...

Published: Feb 3, 2021
Updated: Aug 4, 2024
Assigning CNA: mitre
Evidence observed: Aug 8, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

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

EPSS probability estimate

78.7%

High · next 30 days

Percentile: 99.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Zoho ManageEngine OpManager Stable build before 125203 (and Released build before 125233) allows Remote Code Execution via the Smart Update Manager (SUM) servlet.

Sources

cve-2020-28653-pocPoC
Proof-of-concept exploit for CVE-2020-28653 in ManageEngine OpManager. Detects deserialization vulnerabilities via out-of-band DNS callback using a serialized payload.
ManageEngine-CVE-2020-28653PoC
Proof-of-concept exploit for ManageEngine CVE-2020-28653, demonstrating remote code execution vulnerability in the product's authentication mechanism.
CVE-2020-28653Exploit
Python exploit script for CVE-2020-28653, a remote code execution vulnerability in ManageEngine OpManager. Executes against unpatched versions (2016-2020) via a single HTTP request.

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