CVE-2021-30900

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 2023-03-30), 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: 5%CVSS: 7.8Exploit: cisa kev · ssvc activeExposed: 0

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

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 14.8.1 and iPadOS 14.8.1, iOS 15.1 and iPadOS 15.1. A malicious application may be able to execute arbitrary code with kernel privileges.

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
5%
EPSS %ILE
92%
KEV
⚠ Exploited

Published

August 24, 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-2021-30900
generic🔴 Active Exploitation

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

https://support.apple.com/kb/HT212872
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

About the security content of iOS 15.1 and iPadOS 15.1 - Apple Support

https://support.apple.com/en-us/HT212867

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 16× in last 7d / 70× 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 246 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2021-30900?
CVE-2021-30900 is a critical vulnerability published on August 24, 2021. An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 14.8.1 and iPadOS 14.8.1, iOS 15.1 and iPadOS 15.1. A malicious application may be able to execute arbitrary code with kernel privileges.
When was CVE-2021-30900 disclosed?
CVE-2021-30900 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-2021-30900 actively exploited?
Yes. CISA added CVE-2021-30900 to the Known Exploited Vulnerabilities catalog on March 30, 2023, affecting Apple iOS, iPadOS, and macOS. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-30900?
CVE-2021-30900 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-2021-30900?
CVE-2021-30900 affects Apple iOS, iPadOS, and macOS. 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-2021-30900?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-30900, 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-2021-30900

Explore →

Is Your Infrastructure Affected by CVE-2021-30900?

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

Start Free Scan →Browse All CVEs