CVE-2023-41991

Apple Multiple Products Improper Certificate Validation Vulnerability

Medium 5.5
Exploited: added to CISA KEV 25 Sep 2023

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.

Key facts

Published: 21 Sep 2023
Last changed: 4 Nov 2025
Assigned by: apple
KEV added: 25 Sep 2023
KEV fix due: 16 Oct 2023
EPSS: 13.649% likely to be exploited in the next 30 days, higher than 96.542% of CVEs (scores for 15 Nov 2026)
SSVC (CISA): Exploitation: active; Automatable: no; Technical impact: partial

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

5.5CVSS 3.1, Mediumfrom CISA (ADP container)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

What to do

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

Vendor	Product	Versions
Apple	iOS and iPadOS	unspecified up to but excluding 16.7 (affected)
Apple	macOS	unspecified up to but excluding 13.6 (affected)