CVE-2021-30904

Name: CVE-2021-30904
Creator: NVD / NIST
Published: 2021-08-24T19:15:18.587+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.80%

Last modified Jun 17, 2026

CVE-2021-30904 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. A sync issue was addressed with improved state validation. This issue is fixed in macOS Monterey 12.0.1. EPSS estimates a 0.80% chance of exploitation in the next 30 days.

Description

A sync issue was addressed with improved state validation. This issue is fixed in macOS Monterey 12.0.1. A user's messages may continue to sync after the user has signed out of iMessage.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

0.80%

52.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-662

Affected Software

Vendor	Product	Versions
Apple	Macos	< 12.0.1

References

Timeline

Published: Aug 24, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-30904?

A sync issue was addressed with improved state validation. This issue is fixed in macOS Monterey 12.0.1. A user's messages may continue to sync after the user has signed out of iMessage.

How severe is CVE-2021-30904?

CVE-2021-30904 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.80% probability of exploitation in the next 30 days.

How do I fix CVE-2021-30904?

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-2021-30904?

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

Scan your code now

Source: NVD / NIST