CVE-2023-41991

Name: CVE-2023-41991
Creator: NVD / NIST
Published: 2023-09-21T19:15:11.283+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10Actively ExploitedEPSS 4.55%

Last modified Jun 17, 2026

CVE-2023-41991 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. A certificate validation issue was addressed. This issue is fixed in macOS Ventura 13.6, iOS 16.7 and iPadOS 16.7. CISA has confirmed active exploitation in the wild. EPSS estimates a 4.55% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

4.55%

90.4th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Oct 16, 2023.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Apple	Ipados	< 16.7
Apple	Ipados	17.0
Apple	Iphone Os	< 16.7
Apple	Iphone Os	17.0
Apple	Macos	>= 13.0, < 13.6

References

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

Timeline

Published: Sep 21, 2023
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2023-41991?

How severe is CVE-2023-41991?

CVE-2023-41991 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 4.55% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2023-41991?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-41991?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST