CVE-2021-30807

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: 29%CVSS: 7.8Exploit: cisa kev · ssvc active · epss top5pct · public exploitExposed: 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 memory handling. This issue is fixed in macOS Big Sur 11.5.1, iOS 14.7.1 and iPadOS 14.7.1, watchOS 7.6.1. An application may be able to execute arbitrary code with kernel privileges. Apple is aware of a report that this issue may have been actively exploited.

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
29%
EPSS %ILE
98%
KEV
⚠ Exploited

Published

October 19, 2021

Last Modified

October 23, 2025

Advisory Details (4)

Auto-updated Jun 3, 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-2021-30807
generic🔴 Active Exploitation

About the security content of watchOS 7.6.1 - Apple Support

https://support.apple.com/en-us/HT212713
generic🔴 Active Exploitation

About the security content of iOS 14.7.1 and iPadOS 14.7.1 - Apple Support

https://support.apple.com/en-us/HT212623
generic🔴 Active Exploitation

About the security content of macOS Big Sur 11.5.1 - Apple Support

https://support.apple.com/en-us/HT212622

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 56× in last 7d / 242× 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 793 total refreshes for this CVE.

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

Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoC30440r/gex
    First seen Nov 30, 2021

    Gex is an iOS 14.7 jailbreak using CVE-2021-30807 IOMFB & CVE-2021-30860 exploit(s)

    Open source ↗
  • GitHub PoCjsherman212/iomfb-exploit
    First seen Oct 9, 2021

    Exploit for CVE-2021-30807

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2021-30807?
CVE-2021-30807 is a critical vulnerability published on October 19, 2021. A memory corruption issue was addressed with improved memory handling. This issue is fixed in macOS Big Sur 11.5.1, iOS 14.7.1 and iPadOS 14.7.1, watchOS 7.6.1. An application may be able to execute arbitrary code with kernel privileges. Apple is aware of a report that this issue may have been…
When was CVE-2021-30807 disclosed?
CVE-2021-30807 was first published in the National Vulnerability Database on October 19, 2021, 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-2021-30807 actively exploited?
Yes. CISA added CVE-2021-30807 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-2021-30807?
CVE-2021-30807 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-2021-30807?
CVE-2021-30807 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-2021-30807?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-30807, 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.

Dependency Blast Radius

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