CVE-2020-9983

Name: CVE-2020-9983
Creator: NVD / NIST
Published: 2020-10-16T17:15:18.37+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 2.00%

Last modified Jun 17, 2026

CVE-2020-9983 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in Safari 14.0. EPSS estimates a 2.00% chance of exploitation in the next 30 days.

Description

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in Safari 14.0. Processing maliciously crafted web content may lead to 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

2.00%

78.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

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
Fedoraproject	Fedora	32
Fedoraproject	Fedora	33

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://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BY2OBQZFMEFZOSWXPXHPEHOJXXILEEX2/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PDGBNKYT7NMW7CJ26YFUPUHPJVYGV7IQ/
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://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BY2OBQZFMEFZOSWXPXHPEHOJXXILEEX2/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PDGBNKYT7NMW7CJ26YFUPUHPJVYGV7IQ/
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-2020-9983?

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in Safari 14.0. Processing maliciously crafted web content may lead to code execution.

How severe is CVE-2020-9983?

CVE-2020-9983 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 2.00% probability of exploitation in the next 30 days.

How do I fix CVE-2020-9983?

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-2020-9983?

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

Scan your code now

Source: NVD / NIST