What’s Vulnerable › Vulnerabilities

CVE-2020-28653

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 78.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-02-03 · updated 2026-06-17

Description

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

Affected products

• Zohocorp ManageEngine OpManager: before 12.5; 12.5-build125000, 12.5-build125002, 12.5-build125100, 12.5-build125101, 12.5-build125102, 12.5-build125108 (+52) — fixed in 12.5

How to fix

Upgrade to a fixed version: Zohocorp ManageEngine OpManager 12.5. Check the vendor advisory for mitigations.

References

• http://packetstormsecurity.com/files/164231/ManageEngine-OpManager-SumPDU-Java-Deserialization.html
• https://www.manageengine.com/network-monitoring/help/read-me-complete.html#125203
• https://www.manageengine.com/network-monitoring/help/read-me-complete.html#125233
• http://packetstormsecurity.com/files/164231/ManageEngine-OpManager-SumPDU-Java-Deserialization.html
• https://www.manageengine.com/network-monitoring/help/read-me-complete.html#125203
• https://www.manageengine.com/network-monitoring/help/read-me-complete.html#125233

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