CVE-2020-9819

CRITICALNVD 4.39.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 4.3 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 2%CVSS: 4.3Exploit: cisa kev · ssvc activeExposed: 0

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

A memory consumption issue was addressed with improved memory handling. This issue is fixed in iOS 13.5 and iPadOS 13.5, iOS 12.4.7, watchOS 6.2.5, watchOS 5.3.7. Processing a maliciously crafted mail message may lead to heap corruption.

CVSS v3
4.3
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
2%
EPSS %ILE
81%
KEV
⚠ Exploited

Published

June 9, 2020

Last Modified

October 23, 2025

Advisory Details (5)

Auto-updated Jun 15, 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-2020-9819
generic

About the security content of watchOS 5.3.7 - Apple Support

https://support.apple.com/HT211176
generic

About the security content of watchOS 6.2.5 - Apple Support

https://support.apple.com/HT211175
generic

About the security content of iOS 12.4.7 - Apple Support

https://support.apple.com/HT211169
generic

About the security content of iOS 13.5 and iPadOS 13.5 - Apple Support

https://support.apple.com/HT211168

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 59× in last 7d / 226× 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 661 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2020-9819?
CVE-2020-9819 is a critical vulnerability published on June 9, 2020. A memory consumption issue was addressed with improved memory handling. This issue is fixed in iOS 13.5 and iPadOS 13.5, iOS 12.4.7, watchOS 6.2.5, watchOS 5.3.7. Processing a maliciously crafted mail message may lead to heap corruption.
When was CVE-2020-9819 disclosed?
CVE-2020-9819 was first published in the National Vulnerability Database on June 9, 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-2020-9819 actively exploited?
Yes. CISA added CVE-2020-9819 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Apple iOS, iPadOS, and watchOS. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2020-9819?
CVE-2020-9819 has a CVSS v3 base score of 4.3 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2020-9819?
CVE-2020-9819 affects Apple iOS, iPadOS, and watchOS. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2020-9819?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-9819, 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.

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