CVE-2021-3431 BT: Assertion failure on repeated LL_FEATURE_REQ
An attacker can cause a denial of service in Zephyr RTOS by sending repeated LL_FEATURE_REQ messages, triggering an assertion failure.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-3431?
CVE-2021-3431 is a medium-severity denial of service vulnerability in Zephyrproject Zephyr, published on 28 Jun 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Assertion reachable with repeated LL_FEATURE_REQ. Zephyr versions >= v2.5.0 contain Reachable Assertion (CWE-617). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7548-5m6f-mqv9
Weakness: CWE-617
Which versions are affected by CVE-2021-3431?
It affects 1 product.
Products include Zephyrproject Zephyr.
How do I fix CVE-2021-3431?
No fix has been published for CVE-2021-3431 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-3431 being exploited?
There is no known exploitation of CVE-2021-3431 in the wild and no public exploit code.
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