iOS and iPadOS: Always-Incorrect Control Flow Implementation
CVE-2025-43359 is a critical-severity always-incorrect control flow implementation vulnerability in iOS and iPadOS from Apple, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists versions 18.7, 26 as the first without the flaw, so updating iOS and iPadOS to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.96% chance of exploitation within 30 days, higher than 62% of scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Update iOS and iPadOS to 18.7 or 26, whichever matches your release line, or a later version.
- Update macOS to 14.8 or 15.7 or 26, whichever matches your release line, or a later version.
- Update tvOS to 26 or a later version.
- Read the advisory on support.apple.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Apple | iOS and iPadOS | before 18.7; before 26 | 18.7, 26 |
| Apple | macOS | before 14.8; before 15.7; before 26 | 14.8, 15.7, 26 |
| Apple | tvOS | before 26 | 26 |
| Apple | visionOS | before 26 | 26 |
| Apple | watchOS | before 26 | 26 |
| Apple | iPadOS | before 18.7 | 18.7 |
| Apple | Iphone OS | before 18.7 | 18.7 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by CISA (ADP).
Official description
A logic issue was addressed with improved state management. This issue is fixed in iOS 18.7 and iPadOS 18.7, iOS 26 and iPadOS 26, macOS Sequoia 15.7, macOS Sonoma 14.8, macOS Tahoe 26, tvOS 26, visionOS 26, watchOS 26. A UDP server socket bound to a local interface may become bound to all interfaces.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Always-Incorrect Control Flow Implementation
The code contains a control flow path that does not reflect the algorithm that the path is intended to implement, leading to incorrect behavior any time this path is navigated.
More Always-Incorrect Control Flow Implementation vulnerabilities (CWE-670)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Advisories
- support.apple.com/en-us/125108Release Notes
- support.apple.com/en-us/125109Release Notes
- support.apple.com/en-us/125111Release Notes
- support.apple.com/en-us/125112Release Notes
- support.apple.com/en-us/125114Release Notes
- support.apple.com/en-us/125115Release Notes
- support.apple.com/en-us/125116Release Notes
Other references
- support.apple.com/en-us/125110
- seclists.org/fulldisclosure/2025/Sep/49
- seclists.org/fulldisclosure/2025/Sep/53
- seclists.org/fulldisclosure/2025/Sep/54
- seclists.org/fulldisclosure/2025/Sep/55
- seclists.org/fulldisclosure/2025/Sep/56
- seclists.org/fulldisclosure/2025/Sep/57
- seclists.org/fulldisclosure/2025/Sep/58
Other vulnerabilities in iOS and iPadOS
- 8.8 High severity
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
Recent Always-Incorrect Control Flow Implementation vulnerabilities
- 8.2 High severity
- 9.1 Critical severity
- 7.5 High severity
- 7.1 High severity
- 7.5 High severity
- 8.2 High severity
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