Cyber Resilience

CVE-2023-27931

Apple Ipados ≤ 16.4

Published
08 May 2023
Modified
29 January 2025
Patch / advisory
View advisory
CVSS Score v3.1 5.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
EPSS Score 0.0024 15th percentile
Risk Priority 42 floored blend · peak EPSS

Summary

CVE-2023-27931 is a medium-severity Observable Discrepancy (CWE-203) vulnerability in Apple Ipados. Its CVSS base score is 5.5 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Account Discovery (T1087); ranked at the 15th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability Data

This issue was addressed by removing the vulnerable code. This issue is fixed in macOS Ventura 13.3, macOS Monterey 12.6.3, iOS 16.4 and iPadOS 16.4, macOS Big Sur 11.7.3, tvOS 16.4, watchOS 9.4. An app may be able to access…

more

user-sensitive data.

CWE(s)
NVD-CWE-noinfoCWE-203

Related Threats

MITRE ATT&CK Enterprise Techniques

T1087 Account Discovery Discovery
Adversaries may attempt to get a listing of valid accounts, usernames, or email addresses on a system or within a compromised environment.
attack.mitre.org →
T1110 Brute Force Credential Access
Adversaries may use brute force techniques to gain access to accounts when passwords are unknown or when password hashes are obtained.
attack.mitre.org →
T1595 Active Scanning Reconnaissance
Adversaries may execute active reconnaissance scans to gather information that can be used during targeting.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-23218Same product: Apple Ipados
CVE-2026-64713Same product: Apple Ipados
CVE-2024-27839Same product: Apple Ipados
CVE-2024-54476Same product: Apple Macos
CVE-2023-28202Same product: Apple Ipados
CVE-2023-28200Same product: Apple Ipados
CVE-2023-23499Same product: Apple Ipados
CVE-2023-42936Same product: Apple Ipados
CVE-2024-27806Same product: Apple Ipados
CVE-2023-23500Same product: Apple Ipados

Affected Assets

apple
ipados
≤ 16.4
apple
iphone os
≤ 16.4
apple
macos
≤ 13.3
apple
tvos
≤ 16.4
apple
watchos
≤ 9.4

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 1 hardening rule · 1 OS baseline
Validate
Prove the fix (OWASP ASVS)

—

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-30 Concealment and Misdirection
addresses: CWE-203

Misdirection can normalize or falsify responses to eliminate observable discrepancies that aid reconnaissance.

SC-31 Covert Channel Analysis
addresses: CWE-203

Observable discrepancies in system behavior can be modulated to create covert storage or timing channels; the required analysis detects and constrains such avenues.

SI-11 Error Handling
addresses: CWE-203

Prevents attackers from using observable differences in error responses to infer internal system details or state.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly prevent observable response discrepancies via consistent error handling and timing.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.17 Clock synchronization none match
none

Accurate, synchronized timestamps reduce observable timing discrepancies that an attacker could exploit to infer sensitive information or distinguish between success and failure paths.

References