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: 24%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
24%
EPSS %ILE
98%
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 57× in last 7d / 239× 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 927 total refreshes for this CVE.

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

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2016-4656

Explore →

Is Your Infrastructure Affected by CVE-2016-4656?

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

Book a Demo →Browse All CVEs