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 — 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: 22%CVSS: 7.8Exploit: cisa kev · ssvc active · epss top5pctExposed 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 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
9.0CRITICALhigh 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
22%
EPSS %ILE
97th
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

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 53× in last 7d / 241× 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 1,009 total refreshes for this CVE.

  1. 2026-10-05 19:54 UTCEG score recompute
  2. 2026-10-05 19:54 UTCGHSA enrichment
  3. 2026-10-05 17:39 UTCEPSS rescore
  4. 2026-10-05 15:54 UTCGHSA enrichment
  5. 2026-10-05 11:53 UTCGHSA enrichment
  6. 2026-10-05 07:54 UTCGHSA enrichment
  7. 2026-10-05 03:53 UTCGHSA enrichment
  8. 2026-10-04 23:51 UTCEG score recompute
  9. 2026-10-04 23:51 UTCGHSA enrichment
  10. 2026-10-04 23:18 UTCEPSS rescore
  11. 2026-10-04 19:51 UTCGHSA enrichment
  12. 2026-10-04 15:50 UTCGHSA enrichment
  13. 2026-10-04 11:49 UTCGHSA enrichment
  14. 2026-10-04 07:49 UTCGHSA enrichment
  15. 2026-10-04 03:49 UTCGHSA enrichment
  16. 2026-10-03 23:49 UTCGHSA enrichment
  17. 2026-10-03 19:49 UTCGHSA enrichment
  18. 2026-10-03 15:49 UTCEG score recompute
  19. 2026-10-03 15:48 UTCGHSA enrichment
  20. 2026-10-03 14:22 UTCEPSS rescore
  21. 2026-10-03 11:45 UTCGHSA enrichment
  22. 2026-10-03 07:44 UTCGHSA enrichment
  23. 2026-10-03 03:41 UTCGHSA enrichment
  24. 2026-10-02 23:38 UTCGHSA enrichment
  25. 2026-10-02 19:38 UTCEG score recompute
Show 75 more
  1. 2026-10-02 19:38 UTCGHSA enrichment
  2. 2026-10-02 15:37 UTCGHSA enrichment
  3. 2026-10-02 11:37 UTCGHSA enrichment
  4. 2026-10-02 07:35 UTCGHSA enrichment
  5. 2026-10-02 03:35 UTCGHSA enrichment
  6. 2026-10-01 23:34 UTCEG score recompute
  7. 2026-10-01 23:33 UTCGHSA enrichment
  8. 2026-10-01 19:30 UTCGHSA enrichment
  9. 2026-10-01 15:30 UTCGHSA enrichment
  10. 2026-10-01 11:30 UTCGHSA enrichment
  11. 2026-10-01 07:30 UTCGHSA enrichment
  12. 2026-10-01 03:31 UTCGHSA enrichment
  13. 2026-09-30 23:31 UTCGHSA enrichment
  14. 2026-09-30 19:30 UTCGHSA enrichment
  15. 2026-09-30 15:30 UTCEG score recompute
  16. 2026-09-30 15:30 UTCGHSA enrichment
  17. 2026-09-30 14:59 UTCEPSS rescore
  18. 2026-09-30 11:29 UTCGHSA enrichment
  19. 2026-09-30 07:29 UTCGHSA enrichment
  20. 2026-09-30 03:29 UTCGHSA enrichment
  21. 2026-09-29 23:28 UTCGHSA enrichment
  22. 2026-09-29 19:23 UTCGHSA enrichment
  23. 2026-09-29 15:22 UTCGHSA enrichment
  24. 2026-09-29 11:22 UTCGHSA enrichment
  25. 2026-09-29 07:20 UTCGHSA enrichment
  26. 2026-09-29 03:20 UTCGHSA enrichment
  27. 2026-09-28 23:19 UTCEG score recompute
  28. 2026-09-28 23:19 UTCGHSA enrichment
  29. 2026-09-28 19:19 UTCGHSA enrichment
  30. 2026-09-28 15:18 UTCGHSA enrichment
  31. 2026-09-28 11:17 UTCGHSA enrichment
  32. 2026-09-28 07:17 UTCGHSA enrichment
  33. 2026-09-28 03:17 UTCGHSA enrichment
  34. 2026-09-27 23:17 UTCGHSA enrichment
  35. 2026-09-27 21:51 UTCCISA KEV update
  36. 2026-09-27 19:17 UTCGHSA enrichment
  37. 2026-09-27 15:17 UTCEG score recompute
  38. 2026-09-27 15:16 UTCGHSA enrichment
  39. 2026-09-27 13:41 UTCEPSS rescore
  40. 2026-09-27 11:16 UTCGHSA enrichment
  41. 2026-09-27 07:16 UTCGHSA enrichment
  42. 2026-09-27 03:16 UTCGHSA enrichment
  43. 2026-09-26 23:14 UTCGHSA enrichment
  44. 2026-09-26 19:13 UTCEG score recompute
  45. 2026-09-26 19:13 UTCGHSA enrichment
  46. 2026-09-26 15:54 UTCEPSS rescore
  47. 2026-09-26 15:54 UTCEPSS rescore
  48. 2026-09-26 15:12 UTCGHSA enrichment
  49. 2026-09-26 11:12 UTCGHSA enrichment
  50. 2026-09-26 07:11 UTCGHSA enrichment
  51. 2026-09-26 03:11 UTCEG score recompute
  52. 2026-09-26 03:11 UTCGHSA enrichment
  53. 2026-09-25 23:11 UTCGHSA enrichment
  54. 2026-09-25 19:35 UTCCISA KEV update
  55. 2026-09-25 19:11 UTCGHSA enrichment
  56. 2026-09-25 15:08 UTCGHSA enrichment
  57. 2026-09-25 14:55 UTCCISA KEV update
  58. 2026-09-25 11:07 UTCGHSA enrichment
  59. 2026-09-25 07:07 UTCGHSA enrichment
  60. 2026-09-25 03:06 UTCGHSA enrichment
  61. 2026-09-24 23:06 UTCGHSA enrichment
  62. 2026-09-24 19:31 UTCCISA KEV update
  63. 2026-09-24 19:06 UTCGHSA enrichment
  64. 2026-09-24 15:06 UTCEG score recompute
  65. 2026-09-24 15:06 UTCGHSA enrichment
  66. 2026-09-24 14:00 UTCEPSS rescore
  67. 2026-09-24 11:05 UTCGHSA enrichment
  68. 2026-09-24 07:05 UTCGHSA enrichment
  69. 2026-09-24 03:05 UTCGHSA enrichment
  70. 2026-09-23 23:05 UTCGHSA enrichment
  71. 2026-09-23 19:05 UTCGHSA enrichment
  72. 2026-09-23 15:05 UTCEG score recompute
  73. 2026-09-23 15:05 UTCGHSA enrichment
  74. 2026-09-23 11:04 UTCGHSA enrichment
  75. 2026-09-23 07:04 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 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 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-2020-27930?
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 (CRITICAL).
Which products are affected by CVE-2020-27930?
CVE-2020-27930 affects Apple Multiple Products.
How do I remediate CVE-2020-27930?
No fix for CVE-2020-27930 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.

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