Apple Multiple Products WebKit Memory Corruption Vulnerability
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.
What happened
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.
CISA lists it as exploited, added 04 Dec 2023.
Does it affect you
Names Apple macOS. Enter the product and version you run to place it against the affected range the vendor published.
What to do
- Follow the vendor advisory for the fixed release and any interim mitigation.
support.apple.com - Follow the vendor advisory for the fixed release and any interim mitigation.
support.apple.com - Follow the vendor advisory for the fixed release and any interim mitigation.
support.apple.com - Follow the vendor advisory for the fixed release and any interim mitigation.
support.apple.com - Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
cisa.gov
CISA’s notes for this entry:
Affected, as published to NVD
- macos
- Apple macOS: 14.0 up to the fix in 14.1.2
The record
- NVD status
- Analyzed
- Published
- 30 Nov 2023, last modified 17 Jun 2026 (NVD)
- Severity
- CVSS 3.1 base score 8.8, High — computed here from the vector; NVD states 8.8.
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness
- CWE-787 Out-of-bounds Write (NVD; names by MITRE)
- Exploitation
- Listed in CISA’s Known Exploited Vulnerabilities catalogue since 04 Dec 2023; federal remediation due 25 Dec 2023. CISA entry
- Exploit probability
- EPSS 9.3%, 95th percentile — FIRST, scored 23 Oct 2026. FIRST EPSS
- Vendor
- Apple · Multiple Products (CISA)
References on the NVD record
- support.apple.com/en-us/HT214031Vendor Advisory
- support.apple.com/en-us/HT214032Vendor Advisory
- support.apple.com/en-us/HT214033Vendor Advisory
- support.apple.com/kb/HT214033Vendor Advisory
- support.apple.com/kb/HT214034Vendor Advisory
- support.apple.com/kb/HT214062Vendor Advisory
- seclists.org/fulldisclosure/2023/Dec/12Mailing ListThird Party Advisory
- seclists.org/fulldisclosure/2023/Dec/13Mailing ListThird Party Advisory
- seclists.org/fulldisclosure/2023/Dec/3Mailing ListThird Party Advisory
- seclists.org/fulldisclosure/2023/Dec/4Mailing ListThird Party Advisory
- seclists.org/fulldisclosure/2023/Dec/5Mailing ListThird Party Advisory
- seclists.org/fulldisclosure/2023/Dec/8Mailing ListThird Party Advisory
- seclists.org/fulldisclosure/2024/Jan/35Mailing ListThird Party Advisory
- openwall.com/lists/oss-security/2023/12/05/1Mailing ListThird Party Advisory
- security.gentoo.org/glsa/202401-04Third Party Advisory
- debian.org/security/2023/dsa-5575Mailing ListThird Party Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-42917US Government Resource
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AD2KIHHCUBQC2YYH3FJWAHI5BG3QETOH/Mailing List
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/P5LQS6VEI7VIZNC7QGQ62EOV45R5RJIR/Mailing List
Sources
The verdict above is computed from the products and versions you entered and the affected ranges the vendor published to NVD. It does not inspect your environment, and this site never reports a product as unaffected: why.