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CISA KEV · ACTIVELY EXPLOITED
HIGH severity

CVE-2023-32434

HIGH

CVE-2023-32434 is a high-severity (CVSS 7.8) CWE-190 vulnerability. It is in CISA's Known Exploited Vulnerabilities catalog (added 2023-06-23) — treat it as actively exploited and patch now. No vendor fix is recorded yet; mitigation options are listed below.

An integer overflow was addressed with improved input validation. This issue is fixed in watchOS 9.5.2, macOS Big Sur 11.7.8, iOS 15.7.7 and iPadOS 15.7.7, macOS Monterey 12.6.7, watchOS…

Published
Updated
Affected
4 products
Patched
See advisory
Exploits
5 known
Exploitation data as of Oct 21, 2026 · OSV.dev, NVD, CISA KEV, FIRST.org (EPSS)

Exploitation Status

Actively exploited in the wild

  • Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2023-06-23. Federal agencies were required to remediate by 2023-07-14.
  • A successful exploit gives an attacker total control of the affected component, not partial access.

Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2023-32434.

EPSS Exploitation Probability

via FIRST.org ↗
51.5%probability of exploitation in next 30 days
High Risk0.00%
Lower risk than most CVEs99th percentile — riskier than 99% of all scored CVEsHighest risk
48.6%53.8%59.0%64.2%61.2%51.5%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2023-32434 by exploitation likelihood (EPSS) against impact (CVSS). In the shaded patch-first corner (EPSS 50%+, CVSS 7.0+).

Where this sits among everything scored

Of 395,249 CVEs with a current EPSS score, this one falls in the 50–90% band (highlighted). Counts from FIRST.org, log-scaled.

Description

An integer overflow was addressed with improved input validation. This issue is fixed in watchOS 9.5.2, macOS Big Sur 11.7.8, iOS 15.7.7 and iPadOS 15.7.7, macOS Monterey 12.6.7, watchOS 8.8.1, iOS 16.5.1 and iPadOS 16.5.1, macOS Ventura 13.4.1. An app may be able to execute arbitrary code with kernel privileges. Apple is aware of a report that this issue may have been actively exploited against versions of iOS released before iOS 15.7.

Affected Products

4 products · 9 configurations
OS
ipadosapple
≥ 16.0 && < 16.5.1
range
OS
iphone osapple
≥ 16.0 && < 16.5.1
range
OS
macosapple
≥ 13.0 && < 13.4.1
range
OS
watchosapple
≥ 9.0 && < 9.5.2
range
Exploits & PoCs
5

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

An integer overflow was addressed with improved input validation. This i…

support.apple.comGoogle-sheetJun 2023

An integer overflow was addressed with improved input validation. This i…

cisa.govCISAJun 2023

An integer overflow was addressed with improved input validation. This i…

nvd.nist.govNVDJun 2023

An integer overflow was addressed with improved input validation. This i…

github.comGithubJul 2023

Detection & mitigation playbook

Vulnerability

  1. Detect

    Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).

  2. Remediation status

    No fixed release is recorded for CVE-2023-32434 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.

  3. Mitigate without a patch

    Constrain what reaches the vulnerable code: limit the size and shape of untrusted input, isolate the affected component in a sandboxed or least-privileged process, and enable the platform's memory-safety mitigations (ASLR, stack protector, hardened allocator) so an out-of-bounds access is more likely to fail closed than to be exploitable.

Frequently Asked Questions

An integer overflow was addressed with improved input validation. This issue is fixed in watchOS 9.5.2, macOS Big Sur 11.7.8, iOS 15.7.7 and iPadOS 15.7.7, macOS Monterey 12.6.7, watchOS 8.8.1, iOS 16.5.1 and iPadOS 16.5.1, macOS Ventura 13.4.1. An app may be able to execute arbitrary code with kernel privileges. Apple is aware of a report that this issue may have been actively exploited against versions of iOS released before iOS 15.7.
O3 Security · Impact-Aware SCA

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CVE-2023-32434: High 7.8 (KEV)