CVE-2023-42917

Name: CVE-2023-42917
Creator: NVD / NIST
Published: 2023-11-30T23:15:07.28+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10Actively ExploitedEPSS 9.37%

Last modified Jun 17, 2026

CVE-2023-42917 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. A memory corruption vulnerability was addressed with improved locking. This issue is fixed in iOS 17.1.2 and iPadOS 17.1.2, macOS Sonoma 14.1.2, Safari 17.1.2. CISA has confirmed active exploitation in the wild. EPSS estimates a 9.37% chance of exploitation in the next 30 days.

Description

A memory corruption vulnerability was addressed with improved locking. This issue is fixed in iOS 17.1.2 and iPadOS 17.1.2, macOS Sonoma 14.1.2, Safari 17.1.2. Processing web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been exploited against versions of iOS before iOS 16.7.1.

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

9.37%

94.8th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Dec 25, 2023.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Apple	Safari	< 17.1.2
Apple	Ipados	< 15.8.1
Apple	Ipados	>= 16.0, < 16.7.3
Apple	Ipados	>= 17.0, < 17.1.2
Apple	Iphone Os	< 15.8.1
Apple	Iphone Os	>= 16.0, < 16.7.3
Apple	Iphone Os	>= 17.0, < 17.1.2
Apple	Macos	>= 14.0, < 14.1.2
Debian	Debian Linux	11.0
Debian	Debian Linux	12.0
Fedoraproject	Fedora	38
Fedoraproject	Fedora	39
Webkitgtk	Webkitgtk\+	< 2.42.3

References

http://seclists.org/fulldisclosure/2023/Dec/12Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2023/Dec/13Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2023/Dec/3Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2023/Dec/4Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2023/Dec/5Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2023/Dec/8Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2024/Jan/35Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2023/12/05/1Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AD2KIHHCUBQC2YYH3FJWAHI5BG3QETOH/Mailing List
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/P5LQS6VEI7VIZNC7QGQ62EOV45R5RJIR/Mailing List
https://security.gentoo.org/glsa/202401-04Third Party Advisory
https://support.apple.com/en-us/HT214031Vendor Advisory
https://support.apple.com/en-us/HT214032Vendor Advisory
https://support.apple.com/en-us/HT214033Vendor Advisory
https://support.apple.com/kb/HT214033Vendor Advisory
https://support.apple.com/kb/HT214034Vendor Advisory
https://support.apple.com/kb/HT214062Vendor Advisory
https://www.debian.org/security/2023/dsa-5575Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2023/Dec/12Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2023/Dec/13Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2023/Dec/3Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2023/Dec/4Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2023/Dec/5Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2023/Dec/8Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2024/Jan/35Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2023/12/05/1Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AD2KIHHCUBQC2YYH3FJWAHI5BG3QETOH/Mailing List
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/P5LQS6VEI7VIZNC7QGQ62EOV45R5RJIR/Mailing List
https://security.gentoo.org/glsa/202401-04Third Party Advisory
https://support.apple.com/en-us/HT214031Vendor Advisory
https://support.apple.com/en-us/HT214032Vendor Advisory
https://support.apple.com/en-us/HT214033Vendor Advisory
https://support.apple.com/kb/HT214033Vendor Advisory
https://support.apple.com/kb/HT214034Vendor Advisory
https://support.apple.com/kb/HT214062Vendor Advisory
https://www.debian.org/security/2023/dsa-5575Mailing List, Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-42917US Government Resource

Timeline

Published: Nov 30, 2023
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2023-42917?

How severe is CVE-2023-42917?

CVE-2023-42917 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 9.37% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2023-42917?

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-2023-42917?

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

Scan your code now

Source: NVD / NIST