CVE-2025-24797
📋 TL;DR
CVE-2025-24797 is a critical buffer overflow vulnerability in Meshtastic firmware that allows unauthenticated attackers to execute arbitrary code on affected devices. The vulnerability occurs when devices process malformed mesh packets containing invalid protobuf data. All Meshtastic devices running vulnerable firmware versions are affected.
💻 Affected Systems
- Meshtastic firmware
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise with persistent remote code execution, allowing attackers to control the device, access mesh network traffic, and pivot to other connected devices.
Likely Case
Remote code execution leading to device takeover, data exfiltration, and disruption of mesh network communications.
If Mitigated
Limited impact if devices are isolated from untrusted networks and packet filtering is implemented.
🎯 Exploit Status
The vulnerability requires no authentication or user interaction, making exploitation straightforward for attackers with network access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.6.2
Vendor Advisory: https://github.com/meshtastic/firmware/security/advisories/GHSA-33hw-xhfh-944r
Restart Required: Yes
Instructions:
1. Download Meshtastic firmware version 2.6.2 or later from the official repository. 2. Flash the firmware to all affected devices. 3. Verify the update was successful by checking the firmware version.
🔧 Temporary Workarounds
Network segmentation
allIsolate Meshtastic devices from untrusted networks and implement strict network access controls.
Packet filtering
allImplement network-level filtering to block malformed packets targeting Meshtastic devices.
🧯 If You Can't Patch
- Segment Meshtastic devices into isolated network zones with strict firewall rules
- Implement network monitoring to detect and block exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check the firmware version on Meshtastic devices. If version is below 2.6.2, the device is vulnerable.Check Version:
Use Meshtastic device management interface or serial console to check firmware versionVerify Fix Applied:
Confirm the firmware version is 2.6.2 or higher after patching.📡 Detection & Monitoring
Log Indicators:
- Unusual packet processing errors
- Device crashes or reboots
- Memory corruption warnings
Network Indicators:
- Unusual spike in mesh packet traffic
- Malformed protobuf packets targeting Meshtastic ports
SIEM Query:
Search for: (device_type="meshtastic" AND (event_type="crash" OR event_type="memory_error")) OR (protocol="mesh" AND packet_size>normal_threshold)