CVE-2019-8521

Name: CVE-2019-8521
Creator: NVD / NIST
Published: 2019-12-18T18:15:23.91+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.82%

Last modified Jun 17, 2026

CVE-2019-8521 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. This issue was addressed with improved checks. This issue is fixed in iOS 12.2, macOS Mojave 10.14.4. EPSS estimates a 0.82% chance of exploitation in the next 30 days.

Description

This issue was addressed with improved checks. This issue is fixed in iOS 12.2, macOS Mojave 10.14.4. A malicious application may be able to overwrite arbitrary files.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.82%

52.7th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Apple	Iphone Os	< 12.2
Apple	Mac Os X	< 10.14.4

References

https://support.apple.com/HT209599Vendor Advisory
https://support.apple.com/HT209600Vendor Advisory
https://support.apple.com/HT209599Vendor Advisory
https://support.apple.com/HT209600Vendor Advisory

Timeline

Published: Dec 18, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-8521?

This issue was addressed with improved checks. This issue is fixed in iOS 12.2, macOS Mojave 10.14.4. A malicious application may be able to overwrite arbitrary files.

How severe is CVE-2019-8521?

CVE-2019-8521 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.82% probability of exploitation in the next 30 days.

How do I fix CVE-2019-8521?

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-2019-8521?

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

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Source: NVD / NIST