CVE-2021-31010

HIGHNVD 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
7.5
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 4%CVSS: 7.5Exploit: NoneExposed: 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
88.5%
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 22× in last 7d / 68× 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 135 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2021-31010?
CVE-2021-31010 is a high 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.

Dependency Blast Radius

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