CVE-2025-6693 – A critical memory corruption vulnerability in R... (How to Fix)

📋 TL;DR

A critical memory corruption vulnerability in RT-Thread's device driver functions allows local attackers to potentially execute arbitrary code or crash systems. This affects RT-Thread versions up to 5.1.0. The vulnerability requires local access to exploit.

💻 Affected Systems

Products:

RT-Thread

Versions: Up to and including 5.1.0

Operating Systems: RT-Thread embedded OS

Default Config Vulnerable: ⚠️ Yes

Notes: All systems running vulnerable RT-Thread versions with device driver functionality enabled are affected.

📦 What is this software?

Rt Thread by Rt Thread

View all CVEs affecting Rt Thread →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Local privilege escalation leading to full system compromise, arbitrary code execution, or persistent backdoor installation.

🟠

Likely Case

System crashes, denial of service, or limited privilege escalation depending on attacker's initial access level.

🟢

If Mitigated

Limited impact if proper access controls restrict local user privileges and system hardening is implemented.

🌐 Internet-Facing: LOW - This is a local-only vulnerability requiring access to the system.

🏢 Internal Only: HIGH - Local users or compromised accounts can exploit this vulnerability to gain elevated privileges.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Exploitation requires local access and knowledge of memory corruption techniques. No public exploit code is currently available.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Unknown - vendor did not respond to disclosure

Vendor Advisory: None available

Restart Required: Yes

Instructions:

1. Monitor RT-Thread GitHub repository for patches
2. Apply any available security updates
3. Rebuild and redeploy RT-Thread with patches applied
4. Restart affected systems

🔧 Temporary Workarounds

Restrict Local Access

all

Limit local user access to systems running RT-Thread to reduce attack surface

Disable Unnecessary Device Drivers

all

Remove or disable unused device drivers to reduce exposure to vulnerable functions

🧯 If You Can't Patch

Implement strict access controls to limit local user privileges
Monitor systems for unusual behavior or crashes that may indicate exploitation attempts

🔍 How to Verify

Check if Vulnerable:

Check RT-Thread version: if version is 5.1.0 or earlier, system is vulnerable

Check Version:

Check RT-Thread build configuration or version headers in source code

Verify Fix Applied:

Verify RT-Thread version is later than 5.1.0 after applying any available patches

📡 Detection & Monitoring

Log Indicators:

System crashes
Unexpected process terminations
Memory access violation errors

Network Indicators:

None - local-only vulnerability

SIEM Query:

Search for: (event_type="crash" OR event_type="segfault") AND process_name contains "rt-thread"

📊 Metadata

CVE ID: CVE-2025-6693

CVSS v3 Score: 7.8 (HIGH)

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE: CWE-119

EPSS Score: 0.03% exploit probability (6.7th percentile)

Published: June 26, 2025

Last Updated: July 11, 2025

🔗 References

https://github.com/RT-Thread/rt-thread/issues/10387 Exploit,Issue Tracking
https://vuldb.com/?ctiid.313959 Permissions Required,VDB Entry
https://vuldb.com/?id.313959 Third Party Advisory,VDB Entry
https://vuldb.com/?submit.595813 Third Party Advisory,VDB Entry
https://vuldb.com/?submit.595814 Third Party Advisory,VDB Entry
https://vuldb.com/?submit.595827 Third Party Advisory,VDB Entry
https://vuldb.com/?submit.595869 Third Party Advisory,VDB Entry
https://vuldb.com/?submit.595870 Third Party Advisory,VDB Entry
https://vuldb.com/?submit.595871 Third Party Advisory,VDB Entry

📤 Share & Export

📄 Export Markdown 📋 Export JSON

🔗 Related Vulnerabilities

If you're affected by CVE-2025-6693, you might also want to check these: