CVE-2025-24797 is a vulnerability identified in the Meshtastic firmware, an open-source mesh networking solution widely used for decentralized communication. The core issue stems from improper handling of mesh packets containing invalid Protocol Buffers (protobuf) data, which leads to a heap-based buffer overflow (CWE-122) and improper restriction of operations within memory buffer bounds (CWE-119). Specifically, when a device running a vulnerable version of the Meshtastic firmware (versions prior to 2.6.2) receives malformed mesh packets, the firmware fails to properly validate and restrict memory operations, allowing an attacker to overwrite memory beyond intended boundaries. This memory corruption can enable an attacker to hijack the execution flow of the device, potentially achieving remote code execution (RCE). Notably, exploitation does not require any authentication or user interaction, provided the target device is rebroadcasting packets on the default communication channel. This makes the attack vector particularly dangerous in open or public mesh networks where malicious actors can inject crafted packets remotely. The vulnerability was reserved in January 2025 and publicly disclosed in April 2025, with a patch released in version 2.6.2 of the firmware. No known exploits have been reported in the wild as of the publication date. Given the nature of the vulnerability, it affects the confidentiality, integrity, and availability of the affected devices, as an attacker could execute arbitrary code, potentially leading to device takeover, data leakage, or network disruption within the mesh network.

For European organizations leveraging Meshtastic-based mesh networks, especially in sectors relying on decentralized communication such as emergency services, outdoor event coordination, or rural connectivity projects, this vulnerability poses significant risks. An attacker exploiting this flaw could remotely compromise devices without needing credentials or user interaction, potentially gaining control over network nodes. This could lead to interception or manipulation of sensitive communications, disruption of network availability, or use of compromised nodes as pivot points for further attacks within the network. The impact is heightened in critical infrastructure or public safety contexts where mesh networks are deployed to ensure resilient communication. Additionally, since mesh networks often operate in open environments, the attack surface is broad, increasing the likelihood of exposure. The vulnerability could undermine trust in mesh networking solutions and cause operational disruptions, data breaches, or service outages.

Organizations should immediately verify the firmware version of all Meshtastic devices in their networks and upgrade to version 2.6.2 or later, where the vulnerability is patched. For devices that cannot be updated promptly, network administrators should consider disabling packet rebroadcasting on the default channel to reduce exposure to unauthenticated packet injection. Implementing network segmentation to isolate mesh network devices from critical infrastructure can limit potential lateral movement if a device is compromised. Monitoring network traffic for anomalous or malformed protobuf packets may help detect attempted exploitation. Additionally, organizations should enforce strict physical security controls to prevent unauthorized access to devices and consider deploying intrusion detection systems tailored to mesh network protocols. Regularly auditing device firmware and maintaining an inventory of deployed versions will aid in vulnerability management. Finally, engaging with the Meshtastic community for updates and security advisories can ensure timely awareness of emerging threats.