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CVE-2023-41991

Apple Multiple Products Improper Certificate Validation

5.5 MEDIUMActively exploited (CISA KEV)EPSS 13.4%
  1. Published21 Sept 2023
  2. Added to CISA KEV25 Sept 2023
  3. Remediation due16 Oct 2023
Actively exploited (CISA KEV)

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

Added to KEV: 25 Sept 2023Federal remediation due: 16 Oct 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.

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Affected products

Apple iPadOS< 16.7 · 17.0
Apple iPhone OS< 16.7 · 17.0
Apple macOS≥ 13.0 < 13.6

Remediation

Fixed in
Apple iPadOS≥ 16.7
Apple iPhone OS≥ 16.7
Apple macOS≥ 13.6

References

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Frequently asked

Is CVE-2023-41991 being actively exploited?

Yes. CVE-2023-41991 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 25 Sept 2023.

How severe is CVE-2023-41991?

CVE-2023-41991 has a CVSS 3.1 base score of 5.5, rated medium. EPSS estimates a 13.4% probability of exploitation.

Which products are affected by CVE-2023-41991?

Affected products include Apple iPadOS, Apple iPhone OS, Apple macOS.

How do I fix CVE-2023-41991?

Upgrade affected software to a fixed version, for example Apple iPadOS 16.7, Apple iPhone OS 16.7, Apple macOS 13.6 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2023-41991 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.