CVE-2016-4655

CRITICALNVD 5.59.0▲
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 5.5 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: 33%CVSS: 5.5Exploit: 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 obtain sensitive information from memory via a crafted app.

CVSS v3
5.5
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
33%
EPSS %ILE
98%
KEV
⚠ Exploited

Published

August 25, 2016

Last Modified

June 17, 2026

Advisory Details (6)

Auto-updated May 20, 2026
🔬 Proof of concept available. No patch confirmed yet.
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 10.0.1 - Apple Support

https://support.apple.com/HT207145
generic

About the security content of iOS 9.3.5 - Apple Support

https://support.apple.com/HT207107
generic
http://www.securitytracker.com/id/1036694
generic
http://www.securityfocus.com/bid/92965
generic
http://www.securityfocus.com/bid/92651

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 55× in last 7d / 223× 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 887 total refreshes for this CVE.

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

Publicly available exploits

(4 references)

Working exploit code is in the public domain (1 Metasploit module) (2 GitHub PoCs) (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 ↗
  • GitHub PoCCryptiiiic/skybreak
    First seen Jan 9, 2018

    8.4.1 Jailbreak using CVE-2016-4655 / CVE-2016-4656

    Open source ↗
  • GitHub PoCjndok/PegasusX
    First seen Oct 2, 2016

    OS X 10.11.6 LPE PoC for CVE-2016-4655 / CVE-2016-4656

    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-2016-4655?
CVE-2016-4655 is a critical vulnerability published on August 25, 2016. The kernel in Apple iOS before 9.3.5 allows attackers to obtain sensitive information from memory via a crafted app.
When was CVE-2016-4655 disclosed?
CVE-2016-4655 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-2016-4655 actively exploited?
Yes. CISA added CVE-2016-4655 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-2016-4655?
CVE-2016-4655 has a CVSS v3 base score of 5.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2016-4655?
CVE-2016-4655 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-2016-4655?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-4655, 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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