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 verdictMitigate 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 services: Not assessed

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

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
9.8CRITICALmedium confidence
EG Risk
80
EG Risk 80/100CISA SSVC

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%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
79%
EPSS %ILE
99th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (EG-KEV: weaponized) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

February 3, 2021

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated Oct 4, 2026
No fix on record 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

Packet Storm

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

Data Freshness Timeline

(refreshed 4× 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. 2026-10-06 15:13 UTCEPSS rescore
  2. 2026-10-03 14:22 UTCEPSS rescore
  3. 2026-09-30 15:17 UTCEG score recompute
  4. 2026-09-30 14:59 UTCEPSS rescore
  5. 2026-09-26 15:54 UTCEPSS rescore
  6. 2026-09-26 15:54 UTCEPSS rescore
  7. 2026-09-24 14:00 UTCEPSS rescore
  8. 2026-09-22 14:43 UTCEPSS rescore
  9. 2026-09-21 20:28 UTCEPSS rescore
  10. 2026-09-18 19:23 UTCEPSS rescore
  11. 2026-09-16 14:04 UTCEPSS rescore
  12. 2026-09-13 16:43 UTCEPSS rescore
  13. 2026-09-12 14:57 UTCEPSS rescore
  14. 2026-09-07 15:57 UTCEPSS rescore
  15. 2026-09-06 13:44 UTCEPSS rescore
  16. 2026-09-05 15:24 UTCEPSS rescore
  17. 2026-09-02 14:08 UTCEPSS rescore
  18. 2026-09-01 03:32 UTCEPSS rescore
  19. 2026-08-30 19:14 UTCEPSS rescore
  20. 2026-08-27 14:21 UTCEPSS rescore
  21. 2026-08-25 13:45 UTCEPSS rescore
  22. 2026-08-20 22:52 UTCEPSS rescore
  23. 2026-08-19 17:00 UTCEPSS rescore
  24. 2026-08-16 02:11 UTCEPSS rescore
  25. 2026-08-13 21:57 UTCEPSS rescore
Show 49 more
  1. 2026-08-12 13:47 UTCEPSS rescore
  2. 2026-08-08 16:33 UTCEPSS rescore
  3. 2026-08-04 15:06 UTCEPSS rescore
  4. 2026-07-30 16:25 UTCEPSS rescore
  5. 2026-07-28 15:33 UTCEPSS rescore
  6. 2026-07-26 14:51 UTCEPSS rescore
  7. 2026-07-25 14:15 UTCEPSS rescore
  8. 2026-07-24 14:14 UTCEPSS rescore
  9. 2026-07-23 01:52 UTCEG score recompute
  10. 2026-07-22 22:38 UTCEG score recompute
  11. 2026-07-22 14:05 UTCEPSS rescore
  12. 2026-07-21 15:22 UTCEPSS rescore
  13. 2026-07-21 15:22 UTCEPSS rescore
  14. 2026-07-15 16:55 UTCEPSS rescore
  15. 2026-07-15 16:55 UTCEPSS rescore
  16. 2026-07-13 06:10 UTCEPSS rescore
  17. 2026-07-13 06:10 UTCEPSS rescore
  18. 2026-07-09 19:07 UTCEPSS rescore
  19. 2026-07-07 13:43 UTCEPSS rescore
  20. 2026-07-04 06:29 UTCEPSS rescore
  21. 2026-07-04 06:29 UTCEPSS rescore
  22. 2026-06-27 03:06 UTCEPSS rescore
  23. 2026-06-27 03:06 UTCEPSS rescore
  24. 2026-06-25 13:48 UTCEPSS rescore
  25. 2026-06-23 21:31 UTCEPSS rescore
  26. 2026-06-23 21:31 UTCEPSS rescore
  27. 2026-06-21 14:54 UTCEPSS rescore
  28. 2026-06-21 14:54 UTCEPSS rescore
  29. 2026-06-17 17:50 UTCEPSS rescore
  30. 2026-06-15 17:46 UTCEPSS rescore
  31. 2026-06-14 23:15 UTCEPSS rescore
  32. 2026-06-11 13:58 UTCEPSS rescore
  33. 2026-06-10 22:16 UTCEPSS rescore
  34. 2026-06-08 14:15 UTCEPSS rescore
  35. 2026-06-07 15:23 UTCEPSS rescore
  36. 2026-06-07 15:23 UTCEPSS rescore
  37. 2026-06-07 15:23 UTCEPSS rescore
  38. 2026-06-06 13:46 UTCEPSS rescore
  39. 2026-06-06 13:45 UTCEPSS rescore
  40. 2026-06-05 22:45 UTCEPSS rescore
  41. 2026-06-05 22:45 UTCEPSS rescore
  42. 2026-06-02 20:11 UTCEPSS rescore
  43. 2026-06-02 20:11 UTCEPSS rescore
  44. 2026-05-31 00:15 UTCEPSS rescore
  45. 2026-05-31 00:15 UTCEPSS rescore
  46. 2026-05-27 13:39 UTCEPSS rescore
  47. 2026-05-27 13:39 UTCEPSS rescore
  48. 2026-05-26 21:24 UTCEG score recompute
  49. 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.

  • Metasploitexploit/multi/http/opmanager_sumpdu_deserialization✓ verified
    First seen Jul 26, 2021

    ManageEngine OpManager SumPDU Java Deserialization

    Open source ↗
  • GitHub PoCtuo4n8/CVE-2020-28653
    First seen Jul 31, 2021
    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 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. EchelonGraph's EG-KEV model classifies it as weaponized: a functional public exploit exists. FIRST EPSS estimates a 79% probability of exploitation in the next 30 days (99th percentile of EPSS-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?
No fix for CVE-2020-28653 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix.

Dependency Blast Radius

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