CVE-2025-43520

Exp

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.

Published: 2025-12-12 Last update: 2026-04-03 Assigner: [email protected] Source: [email protected]

NVD Status：Analyzed，CVE State: published

View at NVD, CVE.org, EUVD

Threat Intelligence & Risk Assessment for CVE-2025-43520

KEV EPSS CVSS CWE Affected

Conclusion & alert: CVE-2025-43520 is rated Active Exploitation (70/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.27%). Core evidence: CISA KEV confirms active exploitation (added 2026-03-20) affecting Apple / Multiple Products. a weakness (CWE-120) Unauthenticated remote administrative access may be possible. Mandatory action: The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2025-43520

Name: Apple Multiple Products Classic Buffer Overflow Vulnerability · CISA KEV detail

Exploit added: 2026-03-20

Action due: 2026-04-03

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.

Exploit prediction scoring system (EPSS) score for CVE-2025-43520

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-04-22	0.16%	0.27%	+0.11%
2	2026-04-21	0.27%	0.16%	-0.11%
3	2026-04-06	—	0.27%	—

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-43520

CVSS metrics for this CVE.

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.5	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.8	3.6	[email protected]
5.5	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.8	3.6	134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2025-43520

CWE-120 MITRE ↗

Affected software / configurations for CVE-2025-43520

Vendor	Product	Version	Raw CPE
apple	ipados	< 18.7.2	cpe:2.3:o:apple:ipados::::::::
apple	ipados	26.0	cpe:2.3:o:apple:ipados:26.0:::::::*
apple	iphone_os	< 18.7.2	cpe:2.3:o:apple:iphone_os::::::::
apple	iphone_os	26.0	cpe:2.3:o:apple:iphone_os:26.0:::::::*
apple	macos	>= 14.0, < 14.8.2	cpe:2.3:o:apple:macos::::::::
apple	macos	>= 15.0, < 15.7.2	cpe:2.3:o:apple:macos::::::::
apple	macos	26.0	cpe:2.3:o:apple:macos:26.0:::::::*
apple	tvos	< 26.1	cpe:2.3:o:apple:tvos::::::::
apple	visionos	< 26.1	cpe:2.3:o:apple:visionos::::::::
apple	watchos	< 26.1	cpe:2.3:o:apple:watchos::::::::

References for CVE-2025-43520

URL	Tags
https://support.apple.com/en-us/125632	Release Notes Vendor Advisory
https://support.apple.com/en-us/125633	Release Notes Vendor Advisory
https://support.apple.com/en-us/125634	Release Notes Vendor Advisory
https://support.apple.com/en-us/125635	Release Notes Vendor Advisory
https://support.apple.com/en-us/125636	Release Notes Vendor Advisory
https://support.apple.com/en-us/125637	Release Notes Vendor Advisory
https://support.apple.com/en-us/125638	Release Notes Vendor Advisory
https://support.apple.com/en-us/125639	Release Notes Vendor Advisory
https://cloud.google.com/blog/topics/threat-intelligence/darksword-ios-exploit-chain/	Technical Description
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-43520	US Government Resource

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