A malicious userspace application can cause a integer overflow and bypass security checks performed by system call handlers.

What it means for a small business

If your business uses zephyr, install the vendor's update. If you're not sure whether you use it, ask whoever manages your computers.

How likely is an attack? The Exploit Prediction Scoring System, run by FIRST (the global association of security response teams), puts the odds of this one being exploited in the next 30 days at 0.45%, higher than 38% of CVEs. That’s low, but low isn’t zero, and the odds jump the day someone publishes an exploit. Scored October 29, 2026, updated daily.

Check your own setup

• Website check: reads what your site runs from the outside (WordPress version, plugins it can see, old server software) and matches it against this database.
• Server check: what your web server says about itself, and whether that version has known flaws.

More in zephyrproject-rtos zephyr

• CVE-2023-0779 At the most basic level, an invalid pointer can be input that crashes the device, but with more knowledge of the device’s memory layout, further exploitation isMedium 6.7
• CVE-2021-3329 Lack of proper validation in HCI Host stack initialization can cause a crash of the bluetooth stackCritical 9.6
• CVE-2023-0396 A malicious / defective bluetooth controller can cause buffer overreads in the most functions that process HCI command responses.Medium 6.8
• CVE-2022-3806 Inconsistent handling of error cases in bluetooth hci may lead to a double free condition of a network buffer.Critical 9.8
• CVE-2023-0397 A malicious / defect bluetooth controller can cause a Denial of Service due to unchecked input in le_read_buffer_size_complete.Critical 9.6
• CVE-2021-3966 usb device bluetooth class includes a buffer overflow related to implementation of net_buf_add_mem.Critical 9.6

Sources

• National Vulnerability Database: CVE-2020-10067
• docs.zephyrproject.org
• github.com
• github.com
• github.com
• zephyrprojectsec.atlassian.net