CVE-2023-41991
Published 2023-09-21 · Updated 2026-06-17 · Source product-security@apple.com
Summary
CVE-2023-41991 is a medium-severity (CVSS 5.5) vulnerability in Apple Multiple Products. CISA added it to the Known Exploited Vulnerabilities catalog on September 25, 2023, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by October 16, 2023. CISA does not currently list it as used in ransomware campaigns. Apple has 96 vulnerabilities in the KEV catalog, 0 of them linked to ransomware.
All 96 known-exploited Apple vulnerabilities →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.
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
CISA Known-Exploited Vulnerability
Product: Apple — Multiple Products
Name: Apple Multiple Products Improper Certificate Validation Vulnerability
Date added: 2023-09-25 · Due: 2023-10-16
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
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