Critical MicroPython vulnerabilities (CVE-2024-8946, CVE-2024-8947, CVE-2021-42553) expose systems to RCE & DoS attacks. Learn how to patch Ubuntu 20.04-24.10 and secure IoT/embedded devices with Ubuntu Pro’s 10-year ESM coverage.
Recent security flaws in MicroPython—a lightweight Python 3.x implementation for microcontrollers—could allow attackers to execute arbitrary code or cause system crashes.
Researchers Junwha Hong and Wonil Jang identified two critical vulnerabilities (CVE-2024-8946 & CVE-2024-8947), alongside a third buffer overflow issue (CVE-2021-42553) in Middleware USB Host MCU.
If exploited, these bugs could lead to:
✔ Denial-of-service (DoS) attacks
✔ Remote code execution (RCE)
✔ Heap-based buffer overflows
Affected users must update immediately to mitigate risks.
Detailed Security Analysis
1. Heap-Based Buffer Overflow (CVE-2024-8946)
Vulnerability: Incorrect buffer length handling in
mp_vfs_umount.
Impact: Attackers could craft malicious files to trigger crashes or execute code.
Severity: Critical (CVSS: 9.8)
2. Use-After-Free Memory Exploit (CVE-2024-8947)
Vulnerability: Improper memory management leading to post-release access.
Impact: Potential arbitrary code execution if a malicious file is processed.
Severity: High (CVSS: 8.8)
3. Middleware USB Host Buffer Overflow (CVE-2021-42553)
Vulnerability: Memory mishandling in USB Host MCU.
Impact: Privilege escalation or system crashes.
Severity: Medium (CVSS: 7.5)
How to Protect Your Systems
🔹 Recommended Updates (Ubuntu Versions)
| Ubuntu Release | Fixed Package Version | Availability |
|---|---|---|
| Ubuntu 24.10 | micropython 1.22.1+ds-1ubuntu0.24.10.1 | Standard Update |
| Ubuntu 24.04 LTS | 1.22.1+ds-1ubuntu0.24.04.1~esm1 | Ubuntu Pro Required |
| Ubuntu 22.04 LTS | 1.17+ds-1.1ubuntu2+esm1 | Ubuntu Pro Required |
| Ubuntu 20.04 LTS | 1.12-1ubuntu0.1~esm1 | Ubuntu Pro Required |
⚠ Note: Ubuntu Pro provides 10-year security coverage for 25,000+ packages—free for up to 5 machines.
👉 Get Ubuntu Pro Security Coverage
Why Immediate Action is Crucial
Embedded systems running MicroPython are common in:
IoT devices
Industrial control systems
Robotics & automation
A single exploit could lead to data breaches, system hijacking, or operational disruption.
FAQs on MicroPython Security
❓ How do I check my MicroPython version?
Run:
apt list --installed | grep micropython❓ Is Ubuntu Pro necessary for long-term security?
Yes—ESM (Extended Security Maintenance) ensures patches for 10 years, critical for enterprise deployments.
❓ Can these vulnerabilities be exploited remotely?
Yes, if a malicious file is processed—common in automated systems.
Final Recommendations
Update immediately via
sudo apt update && sudo apt upgradeEnable Ubuntu Pro for extended security.
Audit embedded devices using MicroPython.
🔒 Stay secure—patch now to prevent exploitation.
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