CVE-2023-43000 — Apple Safari Vulnerability

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.

The record classifies CVE-2023-43000 under weakness class CWE-416. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first, and has high impact on confidentiality, integrity, availability. 4 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 361 days ago.

Severity and exploitation probability

CVSS v3.1 base score: 8.8 — HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (FIRST): 4.0% probability of exploitation in the next 30 days, higher than 90.3% of all scored CVEs
CISA KEV: Listed since 2026-03-05, federal remediation deadline 2026-03-26
Threadlinqs priority: 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
Published: 2025-11-05, last modified 2026-09-21

Is CVE-2023-43000 being exploited?

CISA added CVE-2023-43000 to the Known Exploited Vulnerabilities catalog on 2026-03-05, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-03-26 under BOD 22-01. It currently carries a trending score of 48 in the Threadlinqs vulnerability feed.

Affected products and versions

Apple: Safari, Ipados, Iphone Os, Macos

How to fix CVE-2023-43000

The record marks a vendor fix as available for CVE-2023-43000. Patch reference: https://support.apple.com/en-us/HT213982. Vendor advisory: https://support.apple.com/en-us/120324. Because CVE-2023-43000 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-03-26. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2023-43000

5 tracked threats in the Threadlinqs corpus reference CVE-2023-43000, either in the campaign’s CVE list or as an indicator on the campaign record.

DeadTag campaign: Coruna and DarkSword iPhone exploit kits delivered via expired ad/analytics tags, compromised websites and malicious ads — HIGH · 2026-10-27
Coruna and DarkSword iOS Spyware Delivered via Instagram Ads, Hijacked Expired Ad/Analytics Domains and Compromised PrestaShop Stores (DeadTag) — HIGH · 2026-10-27
Coruna and DarkSword iOS Exploit Kits Compromise iPhones via Single Malicious Website (UNC6353, UNC6691, UNC6748, PARS Defense) — HIGH · 2026-10-14
Coruna iOS Exploit Kit — 23 Exploits Across 5 Chains Targeting iOS 13-17.2.1 (CVE-2021-30952, CVE-2023-41974, CVE-2023-43000 + 20 More) — CRITICAL · 2026-03-06
Coruna iOS Exploit Kit — Government-Grade 23-Exploit Arsenal Proliferates from Surveillance Vendor to Russian Espionage and Chinese Cybercriminals Targeting 42K+ Devices — CRITICAL · 2026-03-04

Sources

Enriched from CVE.org, FIRST EPSS, CISA KEV. Last verified by Threadlinqs on 2026-10-10.

Other references

Showing 5 of 6 recorded references.