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CVE-2021-30657

91
FAUCET Score

CVE-2021-30657 is a logic issue affecting macOS Big Sur and Catalina that allows a malicious application to bypass Gatekeeper checks. This vulnerability has a CVSS score of 5.5 (Medium) and can be triggered by an unprivileged user interaction, leading to high integrity impact. Apple has confirmed active exploitation of this zero-day vulnerability, with a Metasploit module available for the Gatekeeper bypass. The high EPSS score, numerous community discussions, and extensive media coverage underscore its significance.

Impacted Technologies

VendorProductVersion(s)CPE
< 11.3CPE match
cpe:2.3:a:apple:macos:*:*:*:*:*:*:*:*
< 2021CPE match
cpe:2.3:a:apple:macos:*:*:*:*:*:*:*:*
>= 10.15, <= 10.15.5CPE matchmatch criteria
cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*
10.15.6CPE matchmatch criteria
cpe:2.3:o:apple:mac_os_x:10.15.6:-:*:*:*:*:*:*
10.15.6CPE matchmatch criteria
cpe:2.3:o:apple:mac_os_x:10.15.6:supplemental_update:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
68.53%
Probability of exploitation in next 30 days
EPSS Percentile
99.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Added to KEV · Nov 3, 2021
Metasploit: macOS Gatekeeper check bypass · Mar 25, 2021
This CVE's current EPSS score of 0.6853 is in the 100th percentile among its peer group of 5,760 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

applevendor investigatingvia nvd_reference
View patch

References

cisa.gov / known-exploited-vulnerabilities-catalog
Third Party AdvisoryUS Government Resource
support.apple.com / en-us/HT212325
Release NotesVendor Advisory
support.apple.com / en-us/HT212326
Release NotesVendor Advisory