CVE-2020-28653

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
9.8EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 79%
  • Public exploit code is available (Metasploit, epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 79%CVSS: 9.8Exploit: Metasploit · epss top5pct · epss high · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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(medium)
EG Risk
80(Track*)
EG Risk 80/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation79% × 40%
Automatability30% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
79%
EPSS %ILE
100%
KEV
Not listed

Published

February 3, 2021

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated Aug 15, 2026
No patch confirmed yet.
generic

Read me | OpManager Help

https://www.manageengine.com/network-monitoring/help/read-me-complete.html#125233
generic

Read me | OpManager Help

https://www.manageengine.com/network-monitoring/help/read-me-complete.html#125203
generic

Locked Out | Packet Storm

http://packetstormsecurity.com/files/164231/ManageEngine-OpManager-SumPDU-Java-Deserialization.html

Data Freshness Timeline

(refreshed 3× in last 7d / 14× 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.

  1. 2026-08-20 22:52 UTCEPSS rescore
  2. 2026-08-19 17:00 UTCEPSS rescore
  3. 2026-08-16 02:11 UTCEPSS rescore
  4. 2026-08-13 21:57 UTCEPSS rescore
  5. 2026-08-12 13:47 UTCEPSS rescore
  6. 2026-08-08 16:33 UTCEPSS rescore
  7. 2026-08-04 15:06 UTCEPSS rescore
  8. 2026-07-30 16:25 UTCEPSS rescore
  9. 2026-07-28 15:33 UTCEPSS rescore
  10. 2026-07-26 14:51 UTCEPSS rescore
  11. 2026-07-25 14:15 UTCEPSS rescore
  12. 2026-07-24 14:14 UTCEPSS rescore
  13. 2026-07-23 01:52 UTCEG score recompute
  14. 2026-07-22 22:38 UTCEG score recompute
  15. 2026-07-22 14:05 UTCEPSS rescore
  16. 2026-07-21 15:22 UTCEPSS rescore
  17. 2026-07-21 15:22 UTCEPSS rescore
  18. 2026-07-15 16:55 UTCEPSS rescore
  19. 2026-07-15 16:55 UTCEPSS rescore
  20. 2026-07-13 06:10 UTCEPSS rescore
  21. 2026-07-13 06:10 UTCEPSS rescore
  22. 2026-07-09 19:07 UTCEPSS rescore
  23. 2026-07-07 13:43 UTCEPSS rescore
  24. 2026-07-04 06:29 UTCEPSS rescore
  25. 2026-07-04 06:29 UTCEPSS rescore
Show 28 more
  1. 2026-06-27 03:06 UTCEPSS rescore
  2. 2026-06-27 03:06 UTCEPSS rescore
  3. 2026-06-25 13:48 UTCEPSS rescore
  4. 2026-06-23 21:31 UTCEPSS rescore
  5. 2026-06-23 21:31 UTCEPSS rescore
  6. 2026-06-21 14:54 UTCEPSS rescore
  7. 2026-06-21 14:54 UTCEPSS rescore
  8. 2026-06-17 17:50 UTCEPSS rescore
  9. 2026-06-15 17:46 UTCEPSS rescore
  10. 2026-06-14 23:15 UTCEPSS rescore
  11. 2026-06-11 13:58 UTCEPSS rescore
  12. 2026-06-10 22:16 UTCEPSS rescore
  13. 2026-06-08 14:15 UTCEPSS rescore
  14. 2026-06-07 15:23 UTCEPSS rescore
  15. 2026-06-07 15:23 UTCEPSS rescore
  16. 2026-06-07 15:23 UTCEPSS rescore
  17. 2026-06-06 13:46 UTCEPSS rescore
  18. 2026-06-06 13:45 UTCEPSS rescore
  19. 2026-06-05 22:45 UTCEPSS rescore
  20. 2026-06-05 22:45 UTCEPSS rescore
  21. 2026-06-02 20:11 UTCEPSS rescore
  22. 2026-06-02 20:11 UTCEPSS rescore
  23. 2026-05-31 00:15 UTCEPSS rescore
  24. 2026-05-31 00:15 UTCEPSS rescore
  25. 2026-05-27 13:39 UTCEPSS rescore
  26. 2026-05-27 13:39 UTCEPSS rescore
  27. 2026-05-26 21:24 UTCEG score recompute
  28. 2026-05-26 21:24 UTCGHSA enrichment

Publicly available exploits

(3 references)

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

  • GitHub PoCtuo4n8/CVE-2020-28653
    First seen Jul 31, 2021
    Open source ↗
  • 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 79% probability of exploitation in the next 30 days, which ranks it in the top 0.4% of all scored CVEs.
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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