Threat Intelligence / CVE / CVE-2025-43520

CVE-2025-43520 — Apple Ipados

CISA KEV
CVSS v3.1 5.5 (MEDIUM) · EPSS 0.2% (higher than 50.7% of all scored CVEs) · Priority 9/10 · Published 2025-12-12

As of 2026-04-03, CVE-2025-43520 is a MEDIUM-severity vulnerability in Apple Ipados, CVSS v3.1 5.5, EPSS 0.2% (50.7th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-03-20), with a US federal remediation deadline of 2026-04-03. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2025-43520, most recently “DarkSword: iOS Exploit Chain Adopted by Multiple Threat Actors (CVE-2026-20700, CVE-2025-43529, CVE-2025-31277)”.

Last updated: 2026-04-03

What is CVE-2025-43520?

A memory corruption issue was addressed with improved memory handling. This issue is fixed in iOS 18.7.2 and iPadOS 18.7.2, iOS 26.1 and iPadOS 26.1, macOS Sequoia 15.7.2, macOS Sonoma 14.8.2, macOS Tahoe 26.1, tvOS 26.1, visionOS 26.1, watchOS 26.1. A malicious application may be able to cause unexpected system termination or write kernel memory.

The record classifies CVE-2025-43520 under weakness class CWE-120. Its CVSS v3 base vector states that the flaw requires local access to the host, needs low-privilege credentials, needs no user interaction, and has high impact on availability. 9 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 275 days ago.

Severity and exploitation probability

CVSS v3.1 base score
5.5 — MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (FIRST)
0.2% probability of exploitation in the next 30 days, higher than 50.7% of all scored CVEs
CISA KEV
Listed since 2026-03-20, federal remediation deadline 2026-04-03
Threadlinqs priority
9/10 — CISA KEV-listed, which Threadlinqs floors at 9
Published
2025-12-12, last modified 2026-04-03

Is CVE-2025-43520 being exploited?

CISA added CVE-2025-43520 to the Known Exploited Vulnerabilities catalog on 2026-03-20, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-04-03 under BOD 22-01. It currently carries a trending score of 28 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2025-43520

The record marks a vendor fix as available for CVE-2025-43520. Vendor advisory: https://support.apple.com/en-us/125632. Because CVE-2025-43520 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-04-03. 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-2025-43520

1 tracked threat in the Threadlinqs corpus references CVE-2025-43520, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Seeded from threadlinqs-intel and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

Full detection coverage & IOCs for threats exploiting CVE-2025-43520 are available via the Threadlinqs MCP server (Purple tier). View plans →

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