CVE-2020-28653

CRITICALNVD 9.89.8—Weaponized

9.8

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

CVSS v3: 9.8
EG Score: 9.8(high)
EPSS: 99.8%
KEV: Not listed

Published

February 3, 2021

Last Modified

November 21, 2024

References (6)

cve@mitrehttp://packetstormsecurity.com/files/164231/ManageEngine-OpManager-SumPDU-Java-Deserialization.html
cve@mitrehttps://www.manageengine.com/network-monitoring/help/read-me-complete.html#125203
cve@mitrehttps://www.manageengine.com/network-monitoring/help/read-me-complete.html#125233
af854a3a-2127-422b-91ae-364da2661108http://packetstormsecurity.com/files/164231/ManageEngine-OpManager-SumPDU-Java-Deserialization.html
af854a3a-2127-422b-91ae-364da2661108https://www.manageengine.com/network-monitoring/help/read-me-complete.html#125203
af854a3a-2127-422b-91ae-364da2661108https://www.manageengine.com/network-monitoring/help/read-me-complete.html#125233

Data Freshness Timeline

(refreshed 8× in last 7d / 16× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-27 13:39 UTCEPSS rescore
2026-05-27 13:39 UTCEPSS rescore
2026-05-26 21:24 UTCEG score recompute
2026-05-26 21:24 UTCGHSA enrichment

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 Metasploit module). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Metasploitexploit/multi/http/opmanager_sumpdu_deserialization✓ verified
First seen Jul 26, 2021
ManageEngine OpManager SumPDU Java Deserialization
Open source ↗
Nucleihttp/cves/2020/CVE-2020-28653.yaml
First seen Jan 1, 2020
ManageEngine OpManager SumPDU 12.1 - 12.5.232 - Java Deserialization
Open source ↗

Frequently asked(5)

What is CVE-2020-28653?

CVE-2020-28653 is a critical vulnerability published on February 3, 2021. Zoho ManageEngine OpManager Stable build before 125203 (and Released build before 125233) allows Remote Code Execution via the Smart Update Manager (SUM) servlet.

When was CVE-2020-28653 disclosed?

CVE-2020-28653 was first published in the National Vulnerability Database on February 3, 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-2020-28653 actively exploited?

CVE-2020-28653 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-28653?

CVE-2020-28653 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2020-28653?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-28653, 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-2020-28653

📅 Published

🔄 Last Modified

🔗 References (6)