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CVE-2023-40399VulnerabilityPublished Updated

CVE-2023-40399: Apple iOS and iPadOS · An app may be able to disclose kernel memory

Affects Apple iOS and iPadOSSource CVE Database V5

0

Not known to be exploited.

Data as of 26 Oct 2026, 06:26 UTC

Severity
High

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

EPSS
0.3% chance of exploitation in 30 days – higher than 25% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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 2026-10-26.

What to do

AI-suggested

Update affected Apple operating systems to the fixed versions: iOS 17, iPadOS 17, tvOS 17, watchOS 10, and macOS Sonoma 14. Applying these official fixes fully mitigates the vulnerability.

Description

CVE-2023-40399 is a vulnerability in Apple iOS and iPadOS where an app may be able to disclose kernel memory. The issue was addressed by Apple with improved memory handling and fixed in iOS 17, iPadOS 17, tvOS 17, watchOS 10, and macOS Sonoma 14.

References

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