What is CVE-2021-30844?

CVE-2021-30844 is a high-severity vulnerability in Apple macOS, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 7.5/10. Published 2021-10-19.

How severe is CVE-2021-30844?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Apple macOS

CVE-2021-30844

A logic issue was addressed with improved state management. This issue is fixed in Security Update 2021-005 Catalina, macOS Big Sur 11.6. A remote attacker may be able to leak memory.

Published 2021-10-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.018 (77.6th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 77.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Apple macOS — versions unspecified
Apple Mac OS X — versions 10.15.7

Weakness classification (CWE)

CWE-401 — Missing Release of Memory after Effective Lifetime

References

support.apple.com/en-us/HT212804 (Release Notes, Vendor Advisory)
support.apple.com/en-us/HT212805 (Release Notes, Vendor Advisory)
support.apple.com/kb/HT212871 (Vendor Advisory)
support.apple.com/kb/HT212872 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-30844?: CVE-2021-30844 is a high-severity vulnerability in Apple macOS, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 7.5/10. Published 2021-10-19.
How severe is CVE-2021-30844?: High severity. CVSS v3 base score is 7.5 out of 10.