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PatchSiren cyber security CVE debrief

CVE-2017-2355 Apple CVE debrief

CVE-2017-2355 is an Apple WebKit vulnerability affecting multiple Apple products before their fixed releases. According to the CVE description, a crafted website could trigger uninitialized memory access leading to application crash, and potentially remote code execution. The published record assigns a high severity score and a network-facing attack vector, but it also requires user interaction.

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

Organizations that manage Apple endpoints or user browsing risk should pay attention, especially where iOS, Safari, iCloud for Windows, iTunes for Windows, or tvOS devices may still be on vulnerable versions. Security teams should also review any WebKit-dependent exposure in mixed environments.

Technical summary

The NVD record describes a WebKit component flaw with CWE-119 classification and CVSS 3.0 vector AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. The issue affects 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, with the CVE text also describing remote exploitation through a crafted website. NVD’s CPE criteria additionally list WebKitGTK+ before 2.16.3.

Defensive priority

High — the issue is network-reachable, requires no privileges, and can lead to code execution or denial of service, so patching vulnerable Apple/WebKit installations should be prioritized.

Recommended defensive actions

  • Upgrade iOS to 10.2.1 or later.
  • Upgrade Safari to 10.0.3 or later.
  • Upgrade iCloud for Windows to 6.1.1 or later.
  • Upgrade iTunes for Windows to 12.5.5 or later.
  • Upgrade tvOS to 10.1.1 or later.
  • Review whether any WebKit-based components or linked products remain on vulnerable versions and remediate them through vendor guidance.
  • Use the Apple security advisories and NVD record to confirm the exact fixed builds in your environment.

Evidence notes

The supplied CVE description states that the issue affects certain Apple products and involves the WebKit component, with remote attackers able to execute arbitrary code or cause denial of service via a crafted website. The NVD record provides the CVSS 3.0 vector AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H and identifies CWE-119. The supplied NVD metadata lists affected version cutoffs for iOS, Safari, iCloud, iTunes, and tvOS, and also includes a WebKitGTK+ CPE criterion. No KEV entry is present in the supplied enrichment.

Sources and references

Verified primary and authoritative sources

  • CVE-2017-2355 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2017-2355

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

  • CVE-2017-2355 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2017-2355

    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.