CVE-2021-30943

Name: CVE-2021-30943
Creator: NVD / NIST
Published: 2021-08-24T19:15:21.267+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.79%

Last modified Jun 17, 2026

CVE-2021-30943 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. An issue in the handling of group membership was resolved with improved logic. This issue is fixed in iOS 15.2 and iPadOS 15.2, watchOS 8.3, macOS Monterey 12.1. EPSS estimates a 0.79% chance of exploitation in the next 30 days.

Description

An issue in the handling of group membership was resolved with improved logic. This issue is fixed in iOS 15.2 and iPadOS 15.2, watchOS 8.3, macOS Monterey 12.1. A malicious user may be able to leave a messages group but continue to receive messages in that group.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

0.79%

51.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-613

Affected Software

Vendor	Product	Versions
Apple	Ipados	< 15.2
Apple	Iphone Os	< 15.2
Apple	Macos	>= 12.0.0, < 12.1
Apple	Watchos	< 8.3

References

Timeline

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

Frequently Asked Questions

What is CVE-2021-30943?

How severe is CVE-2021-30943?

CVE-2021-30943 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.79% probability of exploitation in the next 30 days.

How do I fix CVE-2021-30943?

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-2021-30943?

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

Scan your code now

Source: NVD / NIST