What’s Vulnerable › Vulnerabilities

CVE-2021-1805

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-02 · updated 2026-06-17
• Weakness: CWE-787

Description

An out-of-bounds write was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.2.1, macOS Catalina 10.15.7 Supplemental Update, macOS Mojave 10.14.6 Security Update 2021-002. An application may be able to execute arbitrary code with kernel privileges.

Affected products

• macOS: from 10.14 before 10.14.6; from 10.15 before 10.15.7; 10.14.6, 10.14.6-security_update_2019-001, 10.14.6-security_update_2019-002, 10.14.6-security_update_2020-001, 10.14.6-security_update_2020-002, 10.14.6-security_update_2020-003 (+11) — fixed in 10.14.6, 10.15.7
• Apple macOS: from 11.0 before 11.2 — fixed in 11.2

How to fix

Upgrade to a fixed version: macOS 10.14.6, 10.15.7; Apple macOS 11.2. Check the vendor advisory for mitigations.

References

• http://seclists.org/fulldisclosure/2021/Apr/54
• https://support.apple.com/en-us/HT212177
• https://support.apple.com/kb/HT212327
• http://seclists.org/fulldisclosure/2021/Apr/54
• https://support.apple.com/en-us/HT212177
• https://support.apple.com/kb/HT212327

Get alerted when CVE-2021-1805 or the next vulnerability affects your stack