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Background exploitation KEV catalog No authentication
CVE-2023-42916

Apple Multiple Products WebKit Out-of-Bounds Read Vulnerability

An out-of-bounds read was addressed with improved input validation. 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 disclose sensitive information. Apple is aware of a…

CheckOps priority index
5.5/10 Patch within 7 days
Severity6.5
Probability1.8
Exploitation4/5

Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.

EPSS · today 17.8% higher than 97.2% of CVEs
CVSS 3.1 6.5 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:
Exploited for 1,065 days 04 Dec 2023
CISA due date 25 Dec 2023 for US federal agencies

Exploitation probability EPSS · FIRST

05010026 Sep05 Oct15 Oct24 Oct02 Nov
EPSS probability (%)Percentile among all CVEs

Exploitation signals 4 / 5

  • KEV catalog (CISA)04 Dec 2023
  • Exploited in EUVD (ENISA)04 Dec 2023
  • Used by ransomwareno
  • EPSS above 10 %17.8%
  • No account, over the networkyes

What to do

Fix

Apply the vendor’s fix as soon as it is available.

CISA guidance: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Meanwhile

Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.

Manufacturers (CRA)

Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained

Description ENISA EUVD

An out-of-bounds read was addressed with improved input validation. 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 disclose sensitive information. Apple is aware of a report that this issue may have been exploited against versions of iOS before iOS 16.7.1.

Affected products

macOSiOS and iPadOSSafariMultiple Products
Affected versions
  • unspecified <14.1
  • unspecified <17.1
Weaknesses (CWE)
CWE-125

Open source packages OSV

Affected libraries according to OSV, with fixed versions.

Timeline

  1. Published

  2. Exploitation reported (ENISA)

  3. Added to the KEV catalog

  4. CISA remediation due date

  5. EPSS peak: 17.8%

References

Other exploited vulnerabilities from the same vendor

  • CVE-2026-86950Apple Multiple Products Out-of-Bounds Write Vulnerability
    6.7 · Actively exploited
  • CVE-2026-65400Apple macOS Improper Authentication Vulnerability
    5.8 · Actively exploited
  • CVE-2025-43520Apple Multiple Products Classic Buffer Overflow Vulnerability
    3.4 · Background exploitation
  • CVE-2025-43510Apple Multiple Products Improper Locking Vulnerability
    4.3 · Background exploitation
  • CVE-2025-31277Apple Multiple Products Buffer Overflow Vulnerability
    5.4 · Background exploitation
  • CVE-2023-43000Apple Multiple products Use-After-Free Vulnerability
    5.4 · Background exploitation

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Sources: CISA KEV · ENISA EUVD · FIRST EPSS · OSV. Public data aggregated by CheckOps, updated automatically. Source texts remain the property of their authors. All exploited vulnerabilities