CVE intelligence and bounded remediation

CVE-2023-41991 — Apple Multiple Products Improper Certificate Validation Vulnerability

Medium CVSS 5.5 CISA KEV

A certificate validation issue was addressed. This issue is fixed in macOS Ventura 13.6, iOS 16.7 and iPadOS 16.7. A malicious app may be able to bypass signature validation. Apple is aware of a report that this issue may have been actively exploited against versions of iOS before iOS 16.7.

Severity
Medium
CVSS
5.5 (3.1)
Published
2023-09-21
CISA KEV
Known exploited
Ecosystem
apple/platform
Weaknesses
CWE-295

Affected products

  • apple / ipados
  • apple / ipados / 17.0
  • apple / iphone_os
  • apple / iphone_os / 17.0
  • apple / macos

Matched remediation archetype

Cryptography, certificate, signature, and channel validation

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Inventory affected algorithms, key uses, trust stores, certificate validation settings, random sources, and plaintext channels across clients and services.
  • Determine which secrets, identities, signatures, or data protections depend on the affected primitive or validation path.
  • Check debug, compatibility, fallback, and hostname or audience override settings in build and runtime configuration.

Remediate safely

  • Use a maintained platform cryptographic API with approved algorithms, modes, parameters, randomness, and full peer identity validation.
  • Remove insecure fallback and validation bypasses; separate keys by purpose and load them from managed secret storage.
  • Plan rotation or reissuance for affected keys, certificates, tokens, hashes, or ciphertext and document compatibility sequencing.

Authoritative sources

Complete CVE record and remediation plan

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