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PatchSiren cyber security CVE debrief

CVE-2016-4677 Apple CVE debrief

CVE-2016-4677 is a high-severity Apple WebKit memory corruption issue that could be triggered through a crafted website. According to the supplied CVE metadata, it affects iOS before 10.1, Safari before 10.0.1, and tvOS before 10.0.1. The impact is serious because a remote attacker could potentially execute arbitrary code or cause a denial of service by convincing a user to visit a malicious page.

Vendor
Apple
Product
Safari
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2017-02-20
Original CVE updated
2026-05-13
Advisory published
2017-02-20
Advisory updated
2026-05-13

Who should care

Organizations and individuals running Apple devices or browsers on affected versions should care, especially endpoint teams managing iOS, Safari, or tvOS fleets. Security teams should prioritize any exposed user devices that browse untrusted websites or handle web content regularly.

Technical summary

The CVE describes a WebKit component memory corruption issue classified by NVD as CWE-119. The attack vector is network-based with required user interaction: a victim must load a crafted website. The supplied CVSS vector is CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H, indicating that successful exploitation could affect confidentiality, integrity, and availability. The affected version ranges in the supplied metadata are iOS prior to 10.1, Safari prior to 10.0.1, and tvOS prior to 10.0.1.

Defensive priority

High. This is a remotely triggerable browser/WebKit memory corruption issue with potential code execution, broad user reach, and no privileges required beyond persuading a victim to open a page.

Recommended defensive actions

  • Update iOS devices to 10.1 or later.
  • Update Safari to 10.0.1 or later.
  • Update tvOS to 10.0.1 or later.
  • Prioritize patching devices that browse untrusted or externally supplied web content.
  • Track any residual exposure to older Apple versions in inventory and compliance scans.

Evidence notes

All statements above are based on the supplied CVE record and NVD metadata. The record identifies Apple WebKit as the affected component, lists affected versions as iOS < 10.1, Safari < 10.0.1, and tvOS < 10.0.1, and gives the impact as remote code execution or denial of service via a crafted website. The supplied NVD data also lists CVSS 3.0 vector AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H and weakness CWE-119. Apple vendor advisory links are included in the source corpus, but their page contents were not independently expanded here.

Sources and references

Verified primary and authoritative sources

  • CVE-2016-4677 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2016-4677

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2016-4677 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2016-4677

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.