OS X vulnerabilities: known CVEs & security history
Apple · Actively exploited · 6 tracked CVEs · 0 actively exploited · updated August 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all OS X release lines — 6 in total. A CVE here doesn't mean your version is affected — check OS X's current status and the safe version to run.
Known OS X CVEs
Actively-exploited and most-severe first. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2016-9841 | critical | 9.8 | 8% | 2017 |
| CVE-2021-39537 | high | 8.8 | 3% | 2021 |
| CVE-2016-9842 | high | 8.8 | 5% | 2017 |
| CVE-2016-9840 | high | 8.8 | 5% | 2017 |
| CVE-2011-0627 | high | 8.8 | 5% | 2011 |
| CVE-2018-25032 | high | 7.5 | 52% | 2022 |
Is my OS X version affected?
The list above spans every release. To know whether your version is affected — and the minimum safe version to upgrade to — check it directly.
Check your OS X version → · Monitor OS X for new CVEs →
OS X vulnerabilities — frequently asked
How many known vulnerabilities does OS X have?
IsItPatched tracks 6 CVEs for OS X. 1 is critical-severity and 5 high-severity. These span every release line — what matters is whether the version you run is affected.
Does OS X have any actively-exploited vulnerabilities?
None of OS X's tracked CVEs are currently in CISA's KEV catalog — but new ones can be added at any time, so keep your version current.
What is the most severe OS X vulnerability?
Among tracked issues, CVE-2016-9841 (CRITICAL, CVSS 9.8) ranks highest.
Is OS X safe to use?
It depends on the version. The latest supported OS X release clears the known issues; older versions may still be affected. Check the exact version you run for a verdict.
CVE data aggregated from NVD, CISA KEV and EPSS (FIRST.org). Related: OS X security status · OS X end-of-life · actively-exploited CVEs. Always verify against Apple's advisories — see our disclaimer.