CVE-2021-30883

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 2022-05-23), 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, nvd
Trending — 3 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: 15%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 memory handling. This issue is fixed in iOS 15.0.2 and iPadOS 15.0.2, macOS Monterey 12.0.1, iOS 14.8.1 and iPadOS 14.8.1, tvOS 15.1, watchOS 8.1, macOS Big Sur 11.6.1. 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
15%
EPSS %ILE
96%
KEV
⚠ Exploited

Published

August 24, 2021

Last Modified

October 23, 2025

Advisory Details (6)

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

About the security content of macOS Big Sur 11.6.1 - Apple Support

https://support.apple.com/en-us/HT212872
generic

About the security content of macOS Monterey 12.0.1 - Apple Support

https://support.apple.com/en-us/HT212869
generic🔴 Active Exploitation

About the security content of iOS 14.8.1 and iPadOS 14.8.1 - Apple Support

https://support.apple.com/en-us/HT212868
generic🔴 Active Exploitation

About the security content of iOS 15.0.2 and iPadOS 15.0.2 - Apple Support

https://support.apple.com/en-us/HT212846
generic🔴 Active Exploitation

About the security content of tvOS 15.1 - Apple Support

https://support.apple.com/en-us/HT212876
generic🔴 Active Exploitation

About the security content of watchOS 8.1 - Apple Support

https://support.apple.com/en-us/HT212874

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 17× in last 7d / 71× 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 233 total refreshes for this CVE.

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

Frequently asked(6)

What is CVE-2021-30883?
CVE-2021-30883 is a critical vulnerability published on August 24, 2021. A memory corruption issue was addressed with improved memory handling. This issue is fixed in iOS 15.0.2 and iPadOS 15.0.2, macOS Monterey 12.0.1, iOS 14.8.1 and iPadOS 14.8.1, tvOS 15.1, watchOS 8.1, macOS Big Sur 11.6.1. An application may be able to execute arbitrary code with kernel privileges.…
When was CVE-2021-30883 disclosed?
CVE-2021-30883 was first published in the National Vulnerability Database on August 24, 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-2021-30883 actively exploited?
Yes. CISA added CVE-2021-30883 to the Known Exploited Vulnerabilities catalog on May 23, 2022, 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-2021-30883?
CVE-2021-30883 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-2021-30883?
CVE-2021-30883 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-2021-30883?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-30883, 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

Explore the affected products and dependency analysis for CVE-2021-30883

Explore →

Is Your Infrastructure Affected by CVE-2021-30883?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs