Security Digest · Vulnerability record · Known exploited
CVE-2023-43000: Apple Multiple products Use-After-Free Vulnerability
Exploited in the wild (CISA KEV). A use-after-free issue was addressed with improved memory management.
CISA KEV · added 2026-03-05 CVSS 8.8 High EPSS 4.0% · p91
Should you act?
Exploited: patch now if you run it
CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- Yes, if you run Apple Multiple Products. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-03-05, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-03-26; treat that as the outer limit, not the target.
- EPSS 4.0%, percentile 91: FIRST’s model estimates a 4.0% chance of exploitation activity in the next 30 days, higher than 91% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Needs a user to click or open something. Phishing makes that realistic, but it is not wormable.
What it is
A use-after-free issue was addressed with improved memory management. This issue is fixed in macOS Ventura 13.5, iOS 16.6 and iPadOS 16.6, Safari 16.6, iOS 15.8.7 and iPadOS 15.8.7. Processing maliciously crafted web content may lead to memory corruption.
CISA’s summary
Apple macOS, iOS, iPadOS, and Safari 16.6 contain a use-after-free vulnerability due to the processing of maliciously crafted web content that may lead to memory corruption.
Weakness type: CWE-416.
Product: Apple Multiple Products · Assigned by: apple · Published: 2025-11-05
Affected and fixed versions
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| Apple | macOS | unspecified < 13.5 |
| Apple | iOS and iPadOS | unspecified < 16.6 |
| Apple | Safari | unspecified < 16.6 |
| Apple | iOS and iPadOS | unspecified < 15.8.7 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADP | 3.1 | 8.8 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: none (no login)
- User interaction: required (a user must click/open something)
- Scope: unchanged
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: added 2026-03-05; federal due date 2026-03-26. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active, automatable no, technical impact total.
- FIRST EPSS (model of 2026-10-21): 4.04% probability of exploitation activity in the next 30 days; percentile 91.
Timeline
- — CVE record published by apple
- — Added to CISA’s Known Exploited Vulnerabilities catalog
- — CISA remediation deadline for US federal agencies
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vendor and project advisories, patches
- Listed in CISA KEV notes (support.apple.com) support.apple.com
- Listed in CISA KEV notes (support.apple.com) support.apple.com
- Listed in CISA KEV notes (support.apple.com) support.apple.com
Vulnerability records
- CVE.org record CVE-2023-43000 cve.org
- NVD entry CVE-2023-43000 nvd.nist.gov
Government
Other references from the CVE record and advisory
- support.apple.com support.apple.com
- cloud.google.com cloud.google.com
All exploited Apple vulnerabilities · Today’s Security Digest