CVE-2020-9948

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-10-16 · updated 2026-06-17
Weakness: CWE-843

Description

A type confusion issue was addressed with improved memory handling. This issue is fixed in Safari 14.0. Processing maliciously crafted web content may lead to arbitrary code execution.

Affected products

Apple Safari: before 14.0 — fixed in 14.0
Debian Linux: 10.0
Webkitgtk+: through 2.30.3

How to fix

Upgrade to a fixed version: Apple Safari 14.0. Check the vendor advisory for mitigations.

References

http://seclists.org/fulldisclosure/2020/Nov/18
http://www.openwall.com/lists/oss-security/2020/11/23/3
https://security.gentoo.org/glsa/202012-10
https://support.apple.com/HT211845
https://www.debian.org/security/2020/dsa-4797
http://seclists.org/fulldisclosure/2020/Nov/18
http://www.openwall.com/lists/oss-security/2020/11/23/3
https://security.gentoo.org/glsa/202012-10
https://support.apple.com/HT211845
https://www.debian.org/security/2020/dsa-4797

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