CVE-2020-9951

Name: CVE-2020-9951
Creator: NVD / NIST
Published: 2020-10-16T17:15:17.887+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 2.24%

Last modified Jun 17, 2026

CVE-2020-9951 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. A use after free issue was addressed with improved memory management. This issue is fixed in Safari 14.0. EPSS estimates a 2.24% chance of exploitation in the next 30 days.

Description

A use after free issue was addressed with improved memory management. This issue is fixed in Safari 14.0. Processing maliciously crafted web content may lead to arbitrary code execution.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

2.24%

80.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Apple	Icloud	< 11.5
Apple	Itunes	< 12.10.9
Apple	Safari	< 14.0
Apple	Ipados	< 14.0
Apple	Iphone Os	< 14.0
Apple	Tvos	< 14.0
Apple	Watchos	< 7.0
Webkit	Webkitgtk\+	<= 2.30.3
Debian	Debian Linux	10.0

References

http://seclists.org/fulldisclosure/2020/Nov/18Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2020/Nov/19Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2020/Nov/20Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2020/Nov/22Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/11/23/3Mailing List, Third Party Advisory
https://security.gentoo.org/glsa/202012-10Third Party Advisory
https://support.apple.com/HT211845Release Notes, Vendor Advisory
https://support.apple.com/kb/HT211843Vendor Advisory
https://support.apple.com/kb/HT211844Vendor Advisory
https://support.apple.com/kb/HT211850Vendor Advisory
https://support.apple.com/kb/HT211935Vendor Advisory
https://support.apple.com/kb/HT211952Vendor Advisory
https://www.debian.org/security/2020/dsa-4797Third Party Advisory
http://seclists.org/fulldisclosure/2020/Nov/18Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2020/Nov/19Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2020/Nov/20Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2020/Nov/22Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/11/23/3Mailing List, Third Party Advisory
https://security.gentoo.org/glsa/202012-10Third Party Advisory
https://support.apple.com/HT211845Release Notes, Vendor Advisory
https://support.apple.com/kb/HT211843Vendor Advisory
https://support.apple.com/kb/HT211844Vendor Advisory
https://support.apple.com/kb/HT211850Vendor Advisory
https://support.apple.com/kb/HT211935Vendor Advisory
https://support.apple.com/kb/HT211952Vendor Advisory
https://www.debian.org/security/2020/dsa-4797Third Party Advisory

Timeline

Published: Oct 16, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-9951?

A use after free issue was addressed with improved memory management. This issue is fixed in Safari 14.0. Processing maliciously crafted web content may lead to arbitrary code execution.

How severe is CVE-2020-9951?

CVE-2020-9951 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 2.24% probability of exploitation in the next 30 days.

How do I fix CVE-2020-9951?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-9951?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST