CVE-2021-31010

CRITICALNVD 7.59.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-08-25), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.5 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: 4%CVSS: 7.5Exploit: cisa kev · ssvc activeExposed: 0

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

A deserialization issue was addressed through improved validation. This issue is fixed in Security Update 2021-005 Catalina, iOS 12.5.5, iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6, watchOS 7.6.2. A sandboxed process may be able to circumvent sandbox restrictions. Apple was aware of a report that this issue may have been actively exploited at the time of release..

CVSS v3
7.5
EG Score
9.0(high)
EG Risk
96(Attend)
EG Risk 96/100SSVC: 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%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
4%
EPSS %ILE
89%
KEV
⚠ Exploited

Published

August 24, 2021

Last Modified

October 23, 2025

Advisory Details (5)

Auto-updated Jun 7, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic🔴 Active Exploitation

About the security content of iOS 12.5.5 - Apple Support

https://support.apple.com/en-us/HT212824
generic🔴 Active Exploitation

About the security content of iOS 14.8 and iPadOS 14.8 - Apple Support

https://support.apple.com/en-us/HT212807
generic🔴 Active Exploitation

About the security content of watchOS 7.6.2 - Apple Support

https://support.apple.com/en-us/HT212806
generic🔴 Active Exploitation

About the security content of Security Update 2021-005 Catalina - Apple Support

https://support.apple.com/en-us/HT212805
generic🔴 Active Exploitation

About the security content of macOS Big Sur 11.6 - Apple Support

https://support.apple.com/en-us/HT212804

Weakness Classification(1)

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

Data Freshness Timeline

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

Frequently asked(6)

What is CVE-2021-31010?
CVE-2021-31010 is a critical vulnerability published on August 24, 2021. A deserialization issue was addressed through improved validation. This issue is fixed in Security Update 2021-005 Catalina, iOS 12.5.5, iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6, watchOS 7.6.2. A sandboxed process may be able to circumvent sandbox restrictions. Apple was aware of a report that…
When was CVE-2021-31010 disclosed?
CVE-2021-31010 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-2021-31010 actively exploited?
Yes. CISA added CVE-2021-31010 to the Known Exploited Vulnerabilities catalog on August 25, 2022, affecting Apple iOS, macOS, watchOS. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-31010?
CVE-2021-31010 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2021-31010?
CVE-2021-31010 affects Apple iOS, macOS, watchOS. 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-2021-31010?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-31010, 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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