CVE-2020-3837

CRITICALNVD 7.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-06-27), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.8 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
9.0EG
EchelonGraph verdictMitigate nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 15%CVSS: 7.8Exploit: cisa kev · ssvc active · Exploit-DB (verified) · epss top5pct · public exploitExposed services: Not assessed

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

A memory corruption issue was addressed with improved memory handling. This issue is fixed in iOS 13.3.1 and iPadOS 13.3.1, macOS Catalina 10.15.3, tvOS 13.3.1, watchOS 6.1.2. An application may be able to execute arbitrary code with kernel privileges.

CVSS v3
7.8
EG Score
9.0CRITICALhigh confidence
EG Risk
81
EG Risk 81/100CISA 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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
CISA SSVC: Track at low, Attend at medium and Act 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, sooner than that at medium and as soon as possible at high mission impact, and watch the vendor's advisory for the fix.
EPSS PROB
15%
EPSS %ILE
96th
KEV
⚠ Exploited

CISA SSVCTrack at low, Attend at medium and Act 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, sooner than that at medium and as soon as possible at high mission impact, and watch the vendor's advisory for the fix.

Exploitation active (CISA Vulnrichment) · Automatable no (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

February 27, 2020

Last Modified

October 23, 2025

Advisory Details (5)

Auto-updated Jun 3, 2026
⚠️ Active exploitation confirmed. No fix on record yet. Sources: cisa.
cisa🔴 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-2020-3837
generic

About the security content of watchOS 6.1.2 - Apple Support

https://support.apple.com/HT210921
generic

About the security content of tvOS 13.3.1 - Apple Support

https://support.apple.com/HT210920
generic

About the security content of macOS Catalina 10.15.3, Security Update 2020-001 Mojave, Security Update 2020-001 High Sierra - Apple Support

https://support.apple.com/HT210919
generic

About the security content of iOS 13.3.1 and iPadOS 13.3.1 - Apple Support

https://support.apple.com/HT210918

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 58× in last 7d / 264× 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 1,098 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

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

  • Exploit-DBEDB-48035✓ verified
    First seen Feb 10, 2020

    iOS/macOS - Out-of-Bounds Timestamp Write in IOAccelCommandQueue2::processSegmentKernelCommand()

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2020-3837?
CVE-2020-3837 is a critical vulnerability published on February 27, 2020. A memory corruption issue was addressed with improved memory handling. This issue is fixed in iOS 13.3.1 and iPadOS 13.3.1, macOS Catalina 10.15.3, tvOS 13.3.1, watchOS 6.1.2. An application may be able to execute arbitrary code with kernel privileges.
When was CVE-2020-3837 disclosed?
CVE-2020-3837 was first published on February 27, 2020, with the most recent update on October 23, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-3837 actively exploited?
Yes. CISA added CVE-2020-3837 to the Known Exploited Vulnerabilities catalog on June 27, 2022, affecting Apple Multiple Products. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate attention. No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation, and watch the vendor's advisory for the fix.
What is the CVSS score of CVE-2020-3837?
CVE-2020-3837 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0 (CRITICAL).
Which products are affected by CVE-2020-3837?
CVE-2020-3837 affects Apple Multiple Products.
How do I remediate CVE-2020-3837?
No fix for CVE-2020-3837 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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