CVE-2016-4657

HIGHNVD 8.89.0▲
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 8.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 5 sources updated this weekExploited in the wild
8.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 67%CVSS: 8.8Exploit: NoneExposed: 0

A fix is available — apply it.

WebKit in Apple iOS before 9.3.5 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site.

CVSS v3
8.8
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
99.2%
KEV
⚠ Exploited

Published

August 25, 2016

Last Modified

April 21, 2026

Advisory Details (4)

Auto-updated May 2, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic
http://www.securityfocus.com/bid/92653
generic
https://www.youtube.com/watch?v=xkdPjbaLngE
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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibwebkit2gtk-4.0-doc (2.14.2-0ubuntu0.16.04.1) @ xenial2026-07-20ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 74× in last 7d / 343× 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 662 total refreshes for this CVE.

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

Publicly available exploits

(6 references)

Working exploit code is in the public domain (1 Metasploit module) (3 GitHub PoCs) (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCviai957/webkit-vulnerability
    First seen Nov 11, 2018

    CVE-2016-4657 web-kit vulnerability for ios 9.3, nintendo switch browser vulnerability

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

    WebKit - not_number defineProperties UAF (Metasploit)

    Open source ↗
  • GitHub PoCiDaN5x/Switcheroo
    First seen Jun 2, 2017

    Exploiting CVE-2016-4657 to JailBreak the Nintendo Switch

    Open source ↗
  • GitHub PoCMimoja/CVE-2016-4657-NintendoSwitch
    First seen Mar 13, 2017

    CVE-2016-4657 for NintendoSwitch rwx

    Open source ↗
  • Exploit-DBEDB-44213
    First seen Mar 12, 2017

    Nintendo Switch - WebKit Code Execution (PoC)

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

    WebKit not_number defineProperties UAF

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(6)

What is CVE-2016-4657?
CVE-2016-4657 is a high vulnerability published on August 25, 2016. WebKit in Apple iOS before 9.3.5 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site.
When was CVE-2016-4657 disclosed?
CVE-2016-4657 was first published in the National Vulnerability Database on August 25, 2016, with the most recent update on April 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-4657 actively exploited?
Yes. CISA added CVE-2016-4657 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-2016-4657?
CVE-2016-4657 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2016-4657?
CVE-2016-4657 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-2016-4657?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-4657, 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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