Threat Intelligence / CVE / CVE-2016-4657

CVE-2016-4657 — Apple Iphone Os

CISA KEV

CVSS v3.1 8.8 (HIGH) · EPSS 63.5% (higher than 99.1% of all scored CVEs) · Priority 9/10 · Published 2016-08-25

As of 2025-10-21, CVE-2016-4657 is a HIGH-severity vulnerability in Apple Iphone Os, CVSS v3.1 8.8, EPSS 63.5% (99.1th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-05-24), with a US federal remediation deadline of 2022-06-14. Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2016-4657, most recently “NSO Group Co-Founder Shalev Hulio Held Israeli Diplomatic Passport in Panama, Raising State-Ties Questions for Pegasus Spyware Vendor”.

Last updated: 2025-10-21

What is CVE-2016-4657?

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.

The record classifies CVE-2016-4657 under weakness class CWE-787. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 3671 days ago.

Severity and exploitation probability

CVSS v3.1 base score: 8.8 — HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (FIRST): 63.5% probability of exploitation in the next 30 days, higher than 99.1% of all scored CVEs
CISA KEV: Listed since 2022-05-24, federal remediation deadline 2022-06-14
Threadlinqs priority: 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
Published: 2016-08-25, last modified 2025-10-21

Is CVE-2016-4657 being exploited?

CISA added CVE-2016-4657 to the Known Exploited Vulnerabilities catalog on 2022-05-24, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2022-06-14 under BOD 22-01. Weaponised exploit code for CVE-2016-4657 is publicly available. 4 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 43 in the Threadlinqs vulnerability feed.

iDaN5x/Switcheroo (github)
viai957/webkit-vulnerability (github)
Mimoja/CVE-2016-4657-NintendoSwitch (github)
trickest/cve (trickest)

Affected products and versions

Apple: Iphone Os

How to fix CVE-2016-4657

Vendor advisory: http://lists.apple.com/archives/security-announce/2016/Aug/msg00000.html. Because CVE-2016-4657 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2022-06-14. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2016-4657

2 tracked threats in the Threadlinqs corpus reference CVE-2016-4657, either in the campaign’s CVE list or as an indicator on the campaign record.

NSO Group Co-Founder Shalev Hulio Held Israeli Diplomatic Passport in Panama, Raising State-Ties Questions for Pegasus Spyware Vendor — INFORMATIONAL · 2026-07-28
Pegasus Mercenary Spyware Used for State Surveillance of Azerbaijani Journalists, Activists, and Human Rights Defenders (NSO Group) — HIGH · 2026-06-10

Sources

Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-08-03. This product uses the NVD API but is not endorsed or certified by the NVD.

Vendor advisory and patch

Exploit and proof of concept

exploit-db.com — exploit

Vulnerability database entry

Other references

Full detection coverage & IOCs for threats exploiting CVE-2016-4657 are available via the Threadlinqs MCP server (Purple tier). View plans →

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