CVE-2023-40394

Name: CVE-2023-40394
Creator: NVD / NIST
Published: 2024-01-10T22:15:48.593+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 3.3/10EPSS 0.19%

Last modified Jun 17, 2026

CVE-2023-40394 is a low-severity vulnerability rated 3.3/10 on the CVSS scale. The issue was addressed with improved validation of environment variables. This issue is fixed in iOS 16.6 and iPadOS 16.6. EPSS estimates a 0.19% chance of exploitation in the next 30 days.

Description

The issue was addressed with improved validation of environment variables. This issue is fixed in iOS 16.6 and iPadOS 16.6. An app may be able to access sensitive user data.

Metrics

CVSS 3.1

3.3/10

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

EPSS Probability

0.19%

8.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Apple	Ipados	< 16.6
Apple	Iphone Os	< 16.6

References

https://support.apple.com/en-us/HT213841Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT213841Release Notes, Vendor Advisory

Timeline

Published: Jan 10, 2024
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-40394?

The issue was addressed with improved validation of environment variables. This issue is fixed in iOS 16.6 and iPadOS 16.6. An app may be able to access sensitive user data.

How severe is CVE-2023-40394?

CVE-2023-40394 has a CVSS score of 3.3/10 (LOW severity). The EPSS model estimates a 0.19% probability of exploitation in the next 30 days.

How do I fix CVE-2023-40394?

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-2023-40394?

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

Scan your code now

Source: NVD / NIST