How severe is CVE-2023-43000?

CVE-2023-43000 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-43000 being actively exploited?

Yes. CVE-2023-43000 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-03-05, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2023-43000?

CVE-2023-43000 primarily affects Apple Safari. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-43000?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2023-43000 have an EU (EUVD) identifier?

Yes. CVE-2023-43000 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-47421. It is also flagged as exploited in the EUVD (since 2026-03-05).

When was CVE-2023-43000 published?

CVE-2023-43000 was published on 2025-11-05 and last updated on 2026-06-17.

CVE-2023-43000

CVE-2023-43000 is a high-severity vulnerability in Apple Safari with a CVSS 3.x base score of 8.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-03-05). The underlying weakness is classified as CWE-416.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 4% (89th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2026-03-05)
EU (EUVD) id: EUVD-2023-47421
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2026-03-05)
Weakness: CWE-416
Affected product: Apple Safari
Published: 2025-11-05
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2023-43000?: CVE-2023-43000 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-43000 being actively exploited?: Yes. CVE-2023-43000 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-03-05, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2023-43000?: CVE-2023-43000 primarily affects Apple Safari. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-43000?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2023-43000 have an EU (EUVD) identifier?: Yes. CVE-2023-43000 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-47421. It is also flagged as exploited in the EUVD (since 2026-03-05).
When was CVE-2023-43000 published?: CVE-2023-43000 was published on 2025-11-05 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*

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