CVE-2023-41991

KEVApple Multiple Products Improper Certificate Validation Vulnerability

Description

Apple iOS, iPadOS, macOS, and watchOS contain an improper certificate validation vulnerability that can allow a malicious app to bypass signature validation.

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 3.1 vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

PublishedSep 21, 2023

Last modifiedJun 17, 2026

Added to KEVSep 25, 2023

Remediation dueOct 16, 2023

References

support.apple.com/en-us/HT213927Vendor Advisory
support.apple.com/en-us/HT213931Vendor Advisory
support.apple.com/kb/HT213927Vendor Advisory
support.apple.com/kb/HT213931Vendor Advisory
cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-41991US Government Resource

0 recent articles mention this CVE

Risk assessment · Medium

Actively exploited. Patch immediately.

Exploitation: Confirmed in the wild (CISA KEV)
Federal remediation deadline: Overdue by 1106 days
CVSS: 5.5 MEDIUM
EPSS (30-day exploit probability): 13.4% · top 4% of all CVEs
Weakness: CWE-295

Recommended actions

1.Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
2.Treat as emergency change: patch or isolate internet-facing instances first.
3.Hunt for compromise: review logs for the disclosure window, not just from the patch date.

Assessment is derived automatically from the live signals above; verify against your own asset inventory.