Apple Multiple Products Classic Buffer Overflow Vulnerability
Apple — iOS and iPadOS
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.
5.5
0.4%
Vector breakdown
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Published
- Dec 12, 2025
- Modified
- Apr 2, 2026
- Added to KEV
- Mar 20, 2026
- Federal patch due
- Apr 3, 2026
CISA required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Weakness classification
Proof-of-concept & exploitation references
Weaponization
Public repositories whose name or description references CVE-2025-43520, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
No public GitHub repositories referencing CVE-2025-43520 were found at last check. Absence here is not proof no exploit exists - see the references below for vendor advisories and write-ups.
References
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.
How severe is CVE-2025-43520?
CVE-2025-43520 has a CVSS base score of 5.5 out of 10 (CVSS 3.1).
Is CVE-2025-43520 actively exploited in the wild?
Yes. CVE-2025-43520 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Mar 20, 2026, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2025-43520?
0.4% - meaning FIRST.org's EPSS model estimates a 0.4% probability this vulnerability will be exploited in the wild within 30 days (33% percentile among all scored CVEs).
What type of vulnerability is CVE-2025-43520?
CVE-2025-43520 is classified under CWE-120 (CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')).
Cross-checked against
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