CVE-2023-43000
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.
do firstApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Can a WAF block it? No. The vulnerability involves processing maliciously crafted web content, which is delivered through the browser but not specifically via HTTP requests that a WAF can filter. The attack exploits memory management issues rather than malformed HTTP requests, so a WAF cannot reliably detect or block it.
Also consider: patch
Based on an AI reading of the CVE description, and no vendor rule found yet. We check Cloudflare, AWS, Google Cloud Armor and Azure; for Akamai, Imperva, Fastly, F5, ask your vendor.
Is CVE-2023-43000 being exploited?
Yes. CVE-2023-43000 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.
How severe is CVE-2023-43000?
CVE-2023-43000 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2023-43000?
Yes. A fix has been recorded for CVE-2023-43000. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2023-43000 affect?
CVE-2023-43000 affects apple:safari, apple:ipados, apple:iphone_os, apple:macos. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
- affected< 16.6
- affected< 15.8.7
- affected< 13.5
- affected< 16.6
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.
cisa ssvc
- exploitation
- active
- automatable
- no
- technical impact
- total
Assessed by CISA 6 Mar 2026 (SSVC 2.0.3).
timeline
- 5 Nov 2025Published
- 5 Mar 2026Added to CISA KEV (exploited in the wild) · 119 days (about 4 months) later
- 6 Mar 2026CISA SSVC assessment: exploitation active · 1 day later
- 26 Mar 2026CISA remediation due date (US federal agencies) · 20 days later
- 21 Sept 2026CVE record last updated · 180 days (about 6 months) later
- 2 Nov 2026Analysed by vulneraibility.com · 42 days later
- Advisorycloud.google.com /blog/topics/threat-intelligence/coruna-powerful-ios-exploit-kit
- Linksupport.apple.com /en-us/120331
- Linksupport.apple.com /en-us/120338
- Linksupport.apple.com /en-us/120324
- Linksupport.apple.com /en-us/126632
- Linkcisa.gov /known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-43000
sources
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- CISA KEV catalog: exploitation, date added, due date
- CISA Vulnrichment (ADP): SSVC decision points
- FIRST EPSS: exploit probability and percentile
- Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.