CVE Record
[ MEDIUM ]CVE-2021-30657
Apple macOS Unspecified Vulnerability
Apple macOS contains an unspecified logic issue in System Preferences that may allow a malicious application to bypass Gatekeeper checks.
- Vendor
- Apple
- Product
- macOS
- CVSS
- 5.5
- EPSS (exploit probability)
- 68.5%
- Status
- kev
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2021-30657 being exploited?
Yes. CISA added CVE-2021-30657 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 68.5% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-10-21. Full cross-catalog view: /kev-comparison
What to do
CISA required actionApply updates per vendor instructions.
US federal civilian agencies must remediate by (14 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other Apple macOS CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2026-65400 Apple macOS Improper Authentication Vulnerability | [ CRITICAL ] | 9.8 | 1.7% | |
| CVE-2019-8526 Apple macOS Use-After-Free Vulnerability | [ HIGH ] | 7.8 | 0.7% | |
| CVE-2022-22675 Apple macOS Out-of-Bounds Write Vulnerability | [ HIGH ] | 7.8 | 12.5% | |
| CVE-2022-22674 Apple macOS Out-of-Bounds Read Vulnerability | [ MEDIUM ] | 5.5 | 1.1% | |
| CVE-2021-30713 Apple macOS Unspecified Vulnerability | [ HIGH ] | 7.8 | 7.0% |