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Vulnerabilities

Vulnerability · CVE-2023-41991

Apple Multiple Products Improper Certificate Validation Vulnerability

Published Sep 12, 2023 · catalog updated Jun 16, 2026 · Apple Multiple Products

Patch now

CVE-2023-41991 is in the CISA known-exploited catalog, due Oct 16, 2023. Confirm Apple Multiple Products against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
Medium5.5
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
13.38%
Remediation
Remediation guidance
Affected products
cpe apple/ipados · cpe apple/iphone os · cpe apple/macos · vendor Apple Multiple Products

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe apple/ipados17.0
  • cpe apple/iphone os17.0
  • cpe apple/macosversion unspecified
  • vendor Apple Multiple Productsversion unspecified

How to fix CVE-2023-41991

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2023-41991 is in the CISA known-exploited catalog, due Oct 16, 2023. Confirm Apple Multiple Products against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with apple/iphone os 17.0. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

What should an analyst verify?

CWE-295: Improper Certificate Validation. EPSS 13.38%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 21, 2023 · Catalog

    Detected

    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.

  2. Sep 25, 2023 · CISA KEV

    Known exploited

    Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

  3. Oct 16, 2023 · CISA KEV

    Remediation due

    Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

  4. Jun 16, 2026 · Catalog

    Updated

    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.

Sources

  • CISA KEVConfirmed exploitationCVE-2023-41991

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

    cisa.gov
  • CVE.orgVulnerability recordCVE-2023-41991

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2023-41991

    30-day exploitation probability 13.4%

    first.org
  • NIST NVDVulnerability recordCVE-2023-41991

    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 befor

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2023-41991

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

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.