LiveActive security incident?Get immediate response
CVE Record

CVE-2018-4398: An issue existed in the method for determining prime numbers.

An issue existed in the method for determining prime numbers. This issue was addressed by using pseudorandom bases for testing of primes. This issue affected versions prior to iOS 12.1, macOS Mojave 10.14.1, tvOS 12.1, watchOS 5.1, iTunes 12.9.1, iCloud for Windows 7.8.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

Apple fixed a weakness in how several products determined prime numbers, a cryptographic building block. Systems below the named versions may rely on weaker prime testing. The provided sources do not include severity, impact details, or active exploitation evidence, so urgency should be based on remaining legacy exposure.

Executive priority

Moderate operational priority for legacy-fleet cleanup, but the actual security urgency is uncertain because the sources omit impact and exploitability details. Address through normal patch governance unless critical systems still run affected versions.

Technical view

CVE-2018-4398 concerns Apple’s prime-number determination method. Apple addressed it by using pseudorandom bases for prime testing. Affected products are versions before iOS 12.1, macOS Mojave 10.14.1, tvOS 12.1, watchOS 5.1, iTunes 12.9.1, and iCloud for Windows 7.8.

Likely exposure

Exposure is most likely in legacy Apple devices or Windows systems running outdated iTunes or iCloud versions below the fixed releases. Current managed fleets are less likely exposed if standard OS and application update programs are enforced.

Exploitation context

The source bundle does not show CISA KEV listing, active exploitation, exploit maturity, CVSS, CWE, or attack-vector detail. Treat exploitation status as unconfirmed and avoid assuming remote exploitability from the available evidence.

Researcher notes

The record gives root cause and fixed-version boundaries, but not impact class, attack preconditions, or vulnerable code path. Analysis should stay scoped to Apple’s stated prime-testing issue and avoid inferring exploit chains without additional vendor or researcher evidence.

Mitigation direction

  • Upgrade affected Apple products to the named fixed versions or later.
  • Prioritize unsupported or unmanaged legacy Apple devices for review.
  • Update iTunes for Windows to 12.9.1 or later where installed.
  • Update iCloud for Windows to 7.8 or later where installed.
  • Check Apple advisories for product-specific guidance before exceptions.

Validation and detection

  • Inventory iOS, macOS, tvOS, and watchOS versions across managed devices.
  • Identify Windows hosts with iTunes or iCloud installed.
  • Compare discovered versions against the fixed-version list.
  • Confirm patch compliance through MDM or endpoint management reporting.
  • Document any devices that cannot be upgraded.
Prepared
Confidence
medium
Sources
8

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2018-4398 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
7Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/aiOS, macOS, tvOS, watchOS, iTunes for Windows, iCloud for WindowsVersions prior to: iOS 12.1, macOS Mojave 10.14.1, tvOS 12.1, watchOS 5.1, iTunes 12.9.1, iCloud for Windows 7.8Listed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.