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CVE-2021-30833

42
FAUCET Score

CVE-2021-30833 is a medium-severity vulnerability affecting Apple macOS that allows an attacker to write arbitrary files by tricking a user into unpacking a maliciously crafted archive. The attack requires user interaction (UI:R) and local access (AV:L), but has low attack complexity (AC:L). While not actively exploited (KEV: No) and lacking public exploit code, it garnered significant community discussion and media coverage, indicating awareness. This issue was addressed with improved checks in macOS Monterey 12.0.1.

Impacted Technologies

VendorProductVersion(s)CPE
< 12.0CPE match
cpe:2.3:a:apple:macos:*:*:*:*:*:*:*:*
>= 10.15, < 10.15.7CPE matchmatch criteria
cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*
10.15.7CPE matchmatch criteria
cpe:2.3:o:apple:mac_os_x:10.15.7:-:*:*:*:*:*:*
10.15.7CPE matchmatch criteria
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020:*:*:*:*:*:*
10.15.7CPE matchmatch criteria
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-001:*:*:*:*:*:*

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
42.67%
Probability of exploitation in next 30 days
EPSS Percentile
98.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.4267 is in the 100th percentile among its peer group of 5,765 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

support.apple.com / en-us/HT212869
Vendor Advisory
support.apple.com / kb/HT212871
Vendor Advisory
support.apple.com / kb/HT212872
Vendor Advisory