Vulnerability details
CVE-2025-43520
Actively exploited
Apple iOS and iPadOSApple macOSApple tvOSApple visionOSApple watchOS
CVSS 3.1
5.5Medium
Remedy
Required action (CISA): Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. (due: 2026-04-03)
Versions not listed as affected in the CVE record:
- iOS and iPadOS — version 18.7.2 and later
- iOS and iPadOS — version 26.1 and later
- macOS — version 14.8.2 and later
- macOS — version 15.7.2 and later
- macOS — version 26.1 and later
- tvOS — version 26.1 and later
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 5.5Medium | 3.1 | CISA ADP / Vulnrichment (CISA-ADP) | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Apple | iOS and iPadOS | v < 18.7.2 | CVEProject cvelistV5 (CNA) |
| Apple | iOS and iPadOS | v < 26.1 | CVEProject cvelistV5 (CNA) |
| Apple | macOS | v < 14.8.2 | CVEProject cvelistV5 (CNA) |
| Apple | macOS | v < 15.7.2 | CVEProject cvelistV5 (CNA) |
| Apple | macOS | v < 26.1 | CVEProject cvelistV5 (CNA) |
| Apple | tvOS | v < 26.1 | CVEProject cvelistV5 (CNA) |
| Apple | visionOS | v < 26.1 | CVEProject cvelistV5 (CNA) |
| Apple | watchOS | v < 26.1 | CVEProject cvelistV5 (CNA) |
References and advisories
10- 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
- https://cloud.google.com/blog/topics/threat-intelligence/darksword-ios-exploit-chain/ third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-43520 government-resource
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Details
- Published
- 2025-12-13
- Last updated
- 2026-09-21
- State
- Published
- Assigner (CNA)
- apple
- Kolun priority
- 68 · High
CISA KEV catalog
- Date added
- 2026-03-20
- Due date
- 2026-04-03
- Used in ransomware
- Unknown
Exploit prediction (EPSS)
0.42%
Probability of exploitation in 30 days
37.2%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- Active
- Technical impact
- Total
Weaknesses (CWE)
- CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')