CVE-2021-3433 BT: Invalid channel map in CONNECT_IND results to Deadlock
An attacker can cause a deadlock in Zephyr RTOS by sending an invalid channel map in a CONNECT_IND packet, leading to denial of service.
- 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-2021-3433?
CVE-2021-3433 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
Invalid channel map in CONNECT_IND results to Deadlock. Zephyr versions >= v2.5.0 Improper Check or Handling of Exceptional Conditions (CWE-703). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-3c2f-w4v6-qxrp
Weakness: CWE-703
Which versions are affected by CVE-2021-3433?
It affects 1 product.
Products include Zephyrproject Zephyr.
How do I fix CVE-2021-3433?
No fix has been published for CVE-2021-3433 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-2021-3433 being exploited?
There is no known exploitation of CVE-2021-3433 in the wild and no public exploit code.
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