CVE-2023-42917
Apple iOS, iPadOS, macOS, and Safari WebKit contain a memory corruption vulnerability that leads to code execution when processing maliciously crafted web content. This vulnerability could impact HTML parsers that use WebKit, including but not limited to Apple Safari and non-Apple products which rely on WebKit for HTML processing.
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H- 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
- 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
- security.gentoo.org/glsa/202401-04Third Party Advisory
- support.apple.com/en-us/HT214031Vendor Advisory
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 1037 days
- CVSS
- 8.8 HIGH
- EPSS (30-day exploit probability)
- 9.3% · top 5% of all CVEs
- Weakness
- CWE-787
- Attack vector
- Network, remotely reachable
- 1.Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
- 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.