CVE-2020-2883

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2025-01-07), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 3 sources updated this weekExploited in the wild
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 95%CVSS: 9.8Exploit: cisa kev · ssvc active · Metasploit · epss top5pct · epss high · public exploitExposed services: Not assessed

A fix is available — apply it.

Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core). Supported versions that are affected are 10.3.6.0.0, 12.1.3.0.0, 12.2.1.3.0 and 12.2.1.4.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via IIOP, T3 to compromise Oracle WebLogic Server. Successful attacks of this vulnerability can result in takeover of Oracle WebLogic Server. CVSS 3.0 Base Score 9.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

CVSS v3
9.8
EG Score
9.8CRITICALhigh confidence
EG Risk
99
EG Risk 99/100CISA 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%
Exploitation100% × 40%
Automatability100% × 15%
CISA SSVC: Attend at low mission impact; Act at medium or high.
Action: A fix is available. Apply it sooner than your standard update timelines at low mission impact and as soon as possible at medium or high.
EPSS PROB
95%
EPSS %ILE
99th
KEV
⚠ Exploited

CISA SSVCAttend at low mission impact; Act at medium or high.

A fix is available. Apply it sooner than your standard update timelines at low mission impact and as soon as possible at medium or high.

Exploitation active (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). 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

April 15, 2020

Last Modified

October 27, 2025

Advisory Details (4)

Auto-updated Oct 1, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-2883
generic

ZDI-20-570 - TrendAI™ Zero Day Initiative™ (ZDI)

https://www.zerodayinitiative.com/advisories/ZDI-20-570/
generic

ZDI-20-504 - TrendAI™ Zero Day Initiative™ (ZDI)

https://www.zerodayinitiative.com/advisories/ZDI-20-504/
generic

Packet Storm - Human Validation

http://packetstormsecurity.com/files/157950/WebLogic-Server-Deserialization-Remote-Code-Execution.html

Data Freshness Timeline

(refreshed 46× in last 7d / 211× 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.

Showing the most recent 100 of 876 total refreshes for this CVE.

  1. 2026-10-05 23:58 UTCGHSA enrichment
  2. 2026-10-05 20:01 UTCGHSA enrichment
  3. 2026-10-05 16:04 UTCGHSA enrichment
  4. 2026-10-05 12:07 UTCGHSA enrichment
  5. 2026-10-05 08:10 UTCGHSA enrichment
  6. 2026-10-05 04:12 UTCGHSA enrichment
  7. 2026-10-05 00:12 UTCGHSA enrichment
  8. 2026-10-04 20:13 UTCGHSA enrichment
  9. 2026-10-04 16:14 UTCGHSA enrichment
  10. 2026-10-04 12:16 UTCGHSA enrichment
  11. 2026-10-04 08:20 UTCGHSA enrichment
  12. 2026-10-04 04:22 UTCGHSA enrichment
  13. 2026-10-04 00:25 UTCGHSA enrichment
  14. 2026-10-03 20:28 UTCGHSA enrichment
  15. 2026-10-03 16:31 UTCGHSA enrichment
  16. 2026-10-03 12:34 UTCGHSA enrichment
  17. 2026-10-03 08:36 UTCGHSA enrichment
  18. 2026-10-03 04:38 UTCGHSA enrichment
  19. 2026-10-03 00:40 UTCGHSA enrichment
  20. 2026-10-02 20:43 UTCGHSA enrichment
  21. 2026-10-02 16:45 UTCGHSA enrichment
  22. 2026-10-02 12:48 UTCGHSA enrichment
  23. 2026-10-02 08:51 UTCGHSA enrichment
  24. 2026-10-02 04:51 UTCGHSA enrichment
  25. 2026-10-02 00:53 UTCGHSA enrichment
Show 75 more
  1. 2026-10-01 20:55 UTCGHSA enrichment
  2. 2026-10-01 16:56 UTCGHSA enrichment
  3. 2026-10-01 12:57 UTCGHSA enrichment
  4. 2026-10-01 09:00 UTCGHSA enrichment
  5. 2026-10-01 05:03 UTCGHSA enrichment
  6. 2026-10-01 01:06 UTCGHSA enrichment
  7. 2026-09-30 21:09 UTCGHSA enrichment
  8. 2026-09-30 17:12 UTCEG score recompute
  9. 2026-09-30 17:12 UTCGHSA enrichment
  10. 2026-09-30 14:59 UTCEPSS rescore
  11. 2026-09-30 13:15 UTCGHSA enrichment
  12. 2026-09-30 09:17 UTCGHSA enrichment
  13. 2026-09-30 05:19 UTCGHSA enrichment
  14. 2026-09-30 01:20 UTCGHSA enrichment
  15. 2026-09-29 21:19 UTCGHSA enrichment
  16. 2026-09-29 17:18 UTCGHSA enrichment
  17. 2026-09-29 13:19 UTCGHSA enrichment
  18. 2026-09-29 09:20 UTCGHSA enrichment
  19. 2026-09-29 05:22 UTCGHSA enrichment
  20. 2026-09-29 01:25 UTCEG score recompute
  21. 2026-09-29 01:25 UTCGHSA enrichment
  22. 2026-09-28 21:28 UTCGHSA enrichment
  23. 2026-09-28 17:31 UTCGHSA enrichment
  24. 2026-09-28 13:33 UTCGHSA enrichment
  25. 2026-09-28 09:36 UTCGHSA enrichment
  26. 2026-09-28 05:39 UTCGHSA enrichment
  27. 2026-09-28 01:41 UTCGHSA enrichment
  28. 2026-09-27 21:51 UTCCISA KEV update
  29. 2026-09-27 21:43 UTCGHSA enrichment
  30. 2026-09-27 17:46 UTCGHSA enrichment
  31. 2026-09-27 13:48 UTCGHSA enrichment
  32. 2026-09-27 09:51 UTCGHSA enrichment
  33. 2026-09-27 05:54 UTCGHSA enrichment
  34. 2026-09-27 01:56 UTCGHSA enrichment
  35. 2026-09-26 21:59 UTCGHSA enrichment
  36. 2026-09-26 18:02 UTCGHSA enrichment
  37. 2026-09-26 14:04 UTCGHSA enrichment
  38. 2026-09-26 10:06 UTCGHSA enrichment
  39. 2026-09-26 06:05 UTCGHSA enrichment
  40. 2026-09-26 02:06 UTCGHSA enrichment
  41. 2026-09-25 22:08 UTCGHSA enrichment
  42. 2026-09-25 19:35 UTCCISA KEV update
  43. 2026-09-25 18:10 UTCGHSA enrichment
  44. 2026-09-25 14:55 UTCCISA KEV update
  45. 2026-09-25 14:10 UTCGHSA enrichment
  46. 2026-09-25 10:13 UTCGHSA enrichment
  47. 2026-09-25 06:16 UTCGHSA enrichment
  48. 2026-09-25 02:19 UTCGHSA enrichment
  49. 2026-09-24 22:21 UTCGHSA enrichment
  50. 2026-09-24 19:31 UTCCISA KEV update
  51. 2026-09-24 18:24 UTCGHSA enrichment
  52. 2026-09-24 14:27 UTCEG score recompute
  53. 2026-09-24 14:27 UTCGHSA enrichment
  54. 2026-09-24 14:00 UTCEPSS rescore
  55. 2026-09-24 10:29 UTCGHSA enrichment
  56. 2026-09-24 06:31 UTCGHSA enrichment
  57. 2026-09-24 02:34 UTCGHSA enrichment
  58. 2026-09-23 22:37 UTCGHSA enrichment
  59. 2026-09-23 18:39 UTCGHSA enrichment
  60. 2026-09-23 14:42 UTCGHSA enrichment
  61. 2026-09-23 10:44 UTCGHSA enrichment
  62. 2026-09-23 06:44 UTCGHSA enrichment
  63. 2026-09-23 02:47 UTCGHSA enrichment
  64. 2026-09-22 22:49 UTCGHSA enrichment
  65. 2026-09-22 19:36 UTCCISA KEV update
  66. 2026-09-22 18:51 UTCGHSA enrichment
  67. 2026-09-22 14:54 UTCEG score recompute
  68. 2026-09-22 14:54 UTCGHSA enrichment
  69. 2026-09-22 14:43 UTCEPSS rescore
  70. 2026-09-22 10:56 UTCGHSA enrichment
  71. 2026-09-22 06:59 UTCGHSA enrichment
  72. 2026-09-22 03:02 UTCGHSA enrichment
  73. 2026-09-21 23:04 UTCEG score recompute
  74. 2026-09-21 23:04 UTCGHSA enrichment
  75. 2026-09-21 20:28 UTCEPSS rescore

Publicly available exploits

(7 references)

Working exploit code is in the public domain (1 Metasploit module) (5 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Metasploitexploit/multi/misc/weblogic_deserialize_badattr_extcomp✓ verified
    First seen Apr 30, 2020

    WebLogic Server Deserialization RCE BadAttributeValueExpException ExtComp

    Open source ↗
  • GitHub PoCAl1ex/CVE-2020-2883
    First seen Nov 26, 2020

    CVE-2020-2883

    Open source ↗
  • GitHub PoCFancyDoesSecurity/CVE-2020-2883
    First seen Oct 14, 2020
    Open source ↗
  • GitHub PoCY4er/WebLogic-Shiro-shell
    First seen Aug 19, 2020

    WebLogic利用CVE-2020-2883打Shiro rememberMe反序列化漏洞，一键注册蚁剑filter内存shell

    Open source ↗
  • GitHub PoCMagicZer0/Weblogic_CVE-2020-2883_POC
    First seen May 13, 2020

    Proof of concept for Weblogic CVE-2020-2883

    Open source ↗
  • GitHub PoCY4er/CVE-2020-2883
    First seen May 10, 2020

    Weblogic coherence.jar RCE

    Open source ↗
  • Nucleijavascript/cves/2020/CVE-2020-2883.yaml
    First seen Jan 1, 2020

    Oracle WebLogic Server - Remote Code Execution

    Open source ↗

Frequently asked(6)

What is CVE-2020-2883?
CVE-2020-2883 is a critical vulnerability published on April 15, 2020. Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core). Supported versions that are affected are 10.3.6.0.0, 12.1.3.0.0, 12.2.1.3.0 and 12.2.1.4.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via IIOP, T3 to…
When was CVE-2020-2883 disclosed?
CVE-2020-2883 was first published on April 15, 2020, with the most recent update on October 27, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-2883 actively exploited?
Yes. CISA added CVE-2020-2883 to the Known Exploited Vulnerabilities catalog on January 7, 2025, affecting Oracle WebLogic Server. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate attention. A fix is available. Apply it.
What is the CVSS score of CVE-2020-2883?
CVE-2020-2883 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2020-2883?
CVE-2020-2883 affects Oracle WebLogic Server.
How do I remediate CVE-2020-2883?
A fix for CVE-2020-2883 is available: update to the fixed version the vendor names in its advisory.

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