What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2023-09-25
• EPSS: 13.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-09-21 · updated 2026-06-17
• Weakness: CWE-295

Description

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.

Affected products

• Apple iPadOS: before 16.7; 17.0 — fixed in 16.7
• Apple Iphone Os: before 16.7; 17.0 — fixed in 16.7
• Apple macOS: from 13.0 before 13.6 — fixed in 13.6

How to fix

Upgrade to a fixed version: Apple iPadOS 16.7; Apple Iphone Os 16.7; Apple macOS 13.6. Check the vendor advisory for mitigations.

References

• https://support.apple.com/en-us/HT213927
• https://support.apple.com/en-us/HT213931
• https://support.apple.com/en-us/HT213927
• https://support.apple.com/en-us/HT213931
• https://support.apple.com/kb/HT213927
• https://support.apple.com/kb/HT213931
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-41991

Get alerted when CVE-2023-41991 or the next vulnerability affects your stack