CVE-2025-43300 Apple iOS, iPadOS, and macOS: memory-safety flaw
In plain words: The program mishandles the memory it uses to keep track of data. A specially made input can scramble that memory. Usually lets an attacker crash the program or run their own code with its permissions.
Confirmed exploited by CISA on · US federal patch deadline Sep 11, 2025
What to do
- Install Apple's security update for iOS, iPadOS, and macOS. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Install system updates the day they come out — most phone zero-days are fixed in a point release.
- Restart your phone every few days; some spyware does not survive a reboot.
- If you are a journalist, activist, lawyer, politician or executive, turn on Lockdown Mode (iPhone) or Advanced Protection (Android).
Who is affected
Could reach you. This one is aimed at devices or apps of the kind people own.
What's at risk: Messages, photos, location, microphone and camera. The most serious ones are "zero-click": no tap needed from the owner. They are usually used as spyware against a small number of chosen people.
The details
- Official name
- Apple iOS, iPadOS, and macOS Out-of-Bounds Write Vulnerability
- Product
- Apple iOS, iPadOS, and macOS
- CISA description
- Apple iOS, iPadOS, and macOS contain an out-of-bounds write vulnerability in the Image I/O framework.
- Type of flaw
- Memory-safety flaw (CWE-787)
- Confirmed exploited
- Aug 21, 2025
- US federal patch deadline
- Sep 11, 2025
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Answering about CVE-2025-43300 ·
Questions about CVE-2025-43300
Is CVE-2025-43300 being exploited?
Yes. CISA added CVE-2025-43300 to its Known Exploited Vulnerabilities catalog on Aug 21, 2025, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2025-43300?
Install Apple's security update for iOS, iPadOS, and macOS. If no update exists, follow the vendor's workaround or stop using the product until one ships. Install system updates the day they come out — most phone zero-days are fixed in a point release.
Am I affected by CVE-2025-43300?
Only if you use Apple iOS, iPadOS, and macOS. This one is aimed at devices or apps of the kind people own.