CVE-2016-4656

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 2022-05-24), 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: 21%CVSS: 7.8Exploit: cisa kev · ssvc active · Metasploit · Exploit-DB (verified) · epss top5pct · public exploitExposed: 0

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

The kernel in Apple iOS before 9.3.5 allows attackers to execute arbitrary code in a privileged context or cause a denial of service (memory corruption) via a crafted app.

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
21%
EPSS %ILE
97%
KEV
⚠ Exploited

Published

August 25, 2016

Last Modified

June 17, 2026

Advisory Details (4)

Auto-updated May 19, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic
http://www.securitytracker.com/id/1036694
generic
http://www.securityfocus.com/bid/92652
generic🟡 PoC Available

WebKit - not_number defineProperties UAF (Metasploit) - iOS remote Exploit

https://www.exploit-db.com/exploits/44836/
generic

About the security content of iOS 9.3.5 - Apple Support

https://support.apple.com/HT207107

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 41× in last 7d / 215× 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 458 total refreshes for this CVE.

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

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 Metasploit module) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-44836✓ verified
    First seen Jun 5, 2018

    WebKit - not_number defineProperties UAF (Metasploit)

    Open source ↗
  • Metasploitexploit/apple_ios/browser/webkit_trident✓ verified
    First seen Aug 25, 2016

    WebKit not_number defineProperties UAF

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2016-4656?
CVE-2016-4656 is a critical vulnerability published on August 25, 2016. The kernel in Apple iOS before 9.3.5 allows attackers to execute arbitrary code in a privileged context or cause a denial of service (memory corruption) via a crafted app.
When was CVE-2016-4656 disclosed?
CVE-2016-4656 was first published in the National Vulnerability Database on August 25, 2016, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-4656 actively exploited?
Yes. CISA added CVE-2016-4656 to the Known Exploited Vulnerabilities catalog on May 24, 2022, affecting Apple iOS. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2016-4656?
CVE-2016-4656 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-2016-4656?
CVE-2016-4656 affects Apple iOS. 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-2016-4656?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-4656, 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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