Buffer overflow in Apple iOS And Ipados
CVE-2025-43400
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 18.7.1 and iPadOS 18.7.1, iOS 26.0.1 and iPadOS 26.0.1, macOS Sequoia 15.7.1, macOS Sonoma 14.8.1, macOS Tahoe 26.0.1, tvOS 26.1, visionOS 26.0.1, watchOS 26.1. Processing a maliciously crafted font may lead to unexpected app termination or corrupt process memory.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.064 (93.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 93.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.064 · newest: 0.064 · change: 0.000
Affected products
- Apple iOS And Ipados — versions 0
- Apple Ipados — versions 26.0
- Apple Iphone OS — versions 26.0
- Apple macOS — versions 26.0, 0
- Apple tvOS — versions 0
- Apple Visionos — versions 0
- Apple watchOS — versions 0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- support.apple.com/en-us/125326
- support.apple.com/en-us/125327
- support.apple.com/en-us/125328
- support.apple.com/en-us/125329
- support.apple.com/en-us/125330
- support.apple.com/en-us/125338
- support.apple.com/en-us/125637
- support.apple.com/en-us/125639
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2025-43400?
- CVE-2025-43400 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Out-of-bounds Write. CVSS score: 6.3/10. Published 2025-09-29.
- How severe is CVE-2025-43400?
- Medium severity. CVSS v3 base score is 6.3 out of 10.
- Is CVE-2025-43400 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.