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PatchSiren cyber security CVE debrief

CVE-2017-2356 Apple CVE debrief

CVE-2017-2356 is an Apple WebKit memory corruption issue reported for multiple Apple products. According to the CVE/NVD record, a crafted web site could trigger arbitrary code execution or a denial of service, with affected versions including iOS before 10.2.1, Safari before 10.0.3, iCloud before 6.1.1, iTunes before 12.5.5, and tvOS before 10.1.1. The vulnerability was published on 2017-02-20 and is rated HIGH (CVSS 8.8).

Vendor
Apple
Product
Unknown
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

Security teams managing Apple devices and endpoints, browser administrators, and anyone responsible for patching Safari/WebKit-dependent systems should care most. This also matters for organizations that allow users to browse the web on managed iPhone, iPad, Apple TV, macOS/iTunes-connected Windows systems, or other Apple software that embeds WebKit.

Technical summary

The supplied NVD record describes a WebKit memory corruption flaw (CWE-119) reachable via a crafted web site. The attack vector is network-based and requires user interaction, but no privileges. Impact is high for confidentiality, integrity, and availability. The affected product/version ranges listed in the record are: iOS before 10.2.1; Safari before 10.0.3; iCloud before 6.1.1; iTunes before 12.5.5; and tvOS before 10.1.1. The record also includes a vulnerable WebKitGTK+ range, ending before 2.16.3.

Defensive priority

High. This is a remotely reachable browser/WebKit issue with code-execution potential and a high CVSS score, so it should be patched promptly wherever the affected Apple software is still in use.

Recommended defensive actions

  • Update iOS devices to 10.2.1 or later.
  • Update Safari to 10.0.3 or later on affected systems.
  • Update iCloud to 6.1.1 or later where applicable.
  • Update iTunes to 12.5.5 or later on affected Windows installations.
  • Update tvOS to 10.1.1 or later.
  • Inventory systems and verify installed versions before and after remediation.
  • Prioritize patching for internet-facing browsers and user endpoints that routinely open untrusted web content.
  • Use vendor advisories and official release notes to confirm the exact fixed builds for your platform mix.

Evidence notes

This debrief is based only on the supplied CVE/NVD corpus and the official links listed in the record. The key facts used here are the CVE description, NVD CVSS vector (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H), CWE-119 mapping, affected version ceilings, and the vendor-advisory references attached to the NVD entry. No exploit details or unsupported remediation claims are included.

Sources and references

Verified primary and authoritative sources

  • CVE-2017-2356 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2017-2356

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

  • CVE-2017-2356 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2017-2356

    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.