CVE-2025-43520: tvos Buffer Overflow

Description

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.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CISA Known Exploited Vulnerability

This vulnerability is actively exploited in the wild.

Added: Mar 20, 2026 Remediation due: Apr 3, 2026

Weakness Type (CWE)

CWE-120 CWE-120

Affected Products

Vendor	Product	Versions
apple	ipados	< 18.7.2
apple	ipados	All
apple	iphone_os	< 18.7.2
apple	iphone_os	All
apple	macos	14.0 — 14.8.2
apple	macos	15.0 — 15.7.2
apple	macos	All
apple	tvos	< 26.1
apple	visionos	< 26.1
apple	watchos	< 26.1

References

Advisories & Patches

https://support.apple.com/en-us/125632 https://support.apple.com/en-us/125633 https://support.apple.com/en-us/125634 https://support.apple.com/en-us/125635 https://support.apple.com/en-us/125636 https://support.apple.com/en-us/125637 https://support.apple.com/en-us/125638 https://support.apple.com/en-us/125639

Other References

https://cloud.google.com/blog/topics/threat-intelligence/darksword-ios-exploit-chain/ https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-43520

Frequently Asked Questions

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. It has a CVSS v3.1 base score of 5.5 (MEDIUM). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2025-43520? +

CVE-2025-43520 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-43520? +

CVE-2025-43520 affects products from apple, specifically: ipados, iphone_os, macos, tvos, visionos, watchos. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-43520? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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