CVE-2021-30952 Apple Multiple Products: 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 Mar 26, 2026
What to do
- Install Apple's security update for Multiple Products. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Turn on automatic updates for the operating system and for Office, PDF and archive apps.
- Be careful with unexpected attachments — documents, .zip/.rar files and shortcuts are common bait.
- Use a normal (non-admin) account day to day and keep built-in protection like Microsoft Defender on.
Who is affected
Could reach you. This one is aimed at devices or apps of the kind people own.
What's at risk: Your files, saved passwords and accounts. Many of these let a program that is already running gain full administrator control.
The details
- Official name
- Apple Multiple Products Integer Overflow or Wraparound Vulnerability
- Product
- Apple Multiple Products
- CISA description
- Apple tvOS, macOS, Safari, iPadOS and watchOS contain an integer overflow or wraparound vulnerability due to the processing of maliciously crafted web content that may lead to arbitrary code execution.
- Type of flaw
- Memory-safety flaw (CWE-190)
- Confirmed exploited
- Mar 5, 2026
- US federal patch deadline
- Mar 26, 2026
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Answering about CVE-2021-30952 ·
Questions about CVE-2021-30952
Is CVE-2021-30952 being exploited?
Yes. CISA added CVE-2021-30952 to its Known Exploited Vulnerabilities catalog on Mar 5, 2026, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2021-30952?
Install Apple's security update for Multiple Products. If no update exists, follow the vendor's workaround or stop using the product until one ships. Turn on automatic updates for the operating system and for Office, PDF and archive apps.
Am I affected by CVE-2021-30952?
Only if you use Apple Multiple Products. This one is aimed at devices or apps of the kind people own.