What’s Vulnerable › Vulnerabilities

CVE-2021-30833

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 42.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-10-28 · updated 2026-06-17

Description

This issue was addressed with improved checks. This issue is fixed in macOS Monterey 12.0.1. Unpacking a maliciously crafted archive may allow an attacker to write arbitrary files.

Affected products

• macOS: from 10.15 before 10.15.7; 10.15.7, 10.15.7-security_update_2020, 10.15.7-security_update_2020-001, 10.15.7-security_update_2020-005, 10.15.7-security_update_2020-007, 10.15.7-security_update_2021-001 (+4) — fixed in 10.15.7
• Apple macOS: before 12.0.1; from 11.6 before 11.6.1 — fixed in 11.6.1, 12.0.1

How to fix

Upgrade to a fixed version: macOS 10.15.7; Apple macOS 11.6.1, 12.0.1. Check the vendor advisory for mitigations.

References

• https://support.apple.com/en-us/HT212869
• https://support.apple.com/kb/HT212871
• https://support.apple.com/kb/HT212872
• https://support.apple.com/en-us/HT212869
• https://support.apple.com/kb/HT212871
• https://support.apple.com/kb/HT212872

Get alerted when CVE-2021-30833 or the next vulnerability affects your stack