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CVE-2023-40407VulnerabilityPublished Updated

CVE-2023-40407: Apple macOS · A remote attacker may be able to cause a denial-of-service

Affects Apple macOSSource CVE Database V5

0

Not known to be exploited : upgrade to 14 when convenient.

Data as of 25 Oct 2026, 21:58 UTC

Severity
Medium

Rated Medium by the CNA (apple) · No CVSS score from NVD or the CNA

EPSS
1.7% chance of exploitation in 30 days – higher than 77% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 14

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 26 Sep 2023

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

What to do

Upgrade Apple macOS to 14.

Affected software

ProductAffectedFixed in
Apple macOSAffected
  • <14
Fixed in
  • 14

AI-suggested

Apply the official fix by upgrading to macOS Sonoma 14 or later, where the vulnerability has been addressed with improved bounds checks.

Description

CVE-2023-40407 is a vulnerability in Apple macOS that allows a remote attacker to cause a denial-of-service condition. The issue was addressed by Apple through improved bounds checks and is fixed in macOS Sonoma 14. Versions prior to 14 are affected.

References

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