CVE-2020-27930

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 2021-11-03), 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 — 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: 22%CVSS: 7.8Exploit: cisa kev · ssvc active · epss top5pctExposed: 0

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

A memory corruption issue was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 12.4.9, watchOS 6.2.9, Security Update 2020-006 High Sierra, Security Update 2020-006 Mojave, iOS 14.2 and iPadOS 14.2, watchOS 5.3.9, macOS Catalina 10.15.7 Supplemental Update, macOS Catalina 10.15.7 Update. Processing a maliciously crafted font may lead to arbitrary code execution.

CVSS v3
7.8
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
22%
EPSS %ILE
97%
KEV
⚠ Exploited

Published

December 8, 2020

Last Modified

October 27, 2025

Advisory Details (10)

Auto-updated Jun 3, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic🔴 Active Exploitation

About the security content of macOS Catalina 10.15.7 Supplemental Update, macOS Catalina 10.15.7 Update - Apple Support

https://support.apple.com/en-us/HT211947
generic🔴 Active Exploitation

About the security content of Security Update 2020-006 High Sierra, Security Update 2020-006 Mojave - Apple Support

https://support.apple.com/en-us/HT211946
generic🔴 Active Exploitation

About the security content of watchOS 5.3.9 - Apple Support

https://support.apple.com/en-us/HT211945
generic🔴 Active Exploitation

About the security content of watchOS 6.2.9 - Apple Support

https://support.apple.com/en-us/HT211944
generic🔴 Active Exploitation

About the security content of iOS 12.4.9 - Apple Support

https://support.apple.com/en-us/HT211940
generic🔴 Active Exploitation

About the security content of macOS Big Sur 11.0.1 - Apple Support

https://support.apple.com/en-us/HT211931
generic🔴 Active Exploitation

About the security content of iOS 14.2 and iPadOS 14.2 - Apple Support

https://support.apple.com/en-us/HT211929
generic🔴 Active Exploitation

About the security content of watchOS 7.1 - Apple Support

https://support.apple.com/en-us/HT211928
generic🔴 Active Exploitation

Full Disclosure: APPLE-SA-2020-12-14-4 Additional information for APPLE-SA-2020-11-13-1 macOS Big Sur 11.0.1

http://seclists.org/fulldisclosure/2020/Dec/32
generic

Packet Storm

http://packetstormsecurity.com/files/161294/Apple-Safari-Remote-Code-Execution.html

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 60× in last 7d / 229× 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 643 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2020-27930?
CVE-2020-27930 is a critical vulnerability published on December 8, 2020. A memory corruption issue was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 12.4.9, watchOS 6.2.9, Security Update 2020-006 High Sierra, Security Update 2020-006 Mojave, iOS 14.2 and iPadOS 14.2, watchOS 5.3.9, macOS Catalina 10.15.7…
When was CVE-2020-27930 disclosed?
CVE-2020-27930 was first published in the National Vulnerability Database on December 8, 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-2020-27930 actively exploited?
Yes. CISA added CVE-2020-27930 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Apple Multiple Products. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2020-27930?
CVE-2020-27930 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.
Which products are affected by CVE-2020-27930?
CVE-2020-27930 affects Apple Multiple Products. 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-2020-27930?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-27930, 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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