What’s Vulnerable › Vulnerabilities
CVE-2025-21608: Forged packets over MQTT can show up in direct messages in Meshtastic firmware
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-02-18 · updated 2026-06-17
- Weakness: CWE-668
Description
Meshtastic is an open source mesh networking solution. In affected firmware versions crafted packets over MQTT are able to appear as a DM in client to a node even though they were not decoded with PKC. This issue has been addressed in version 2.5.19 and all users are advised to upgrade. There are no known workarounds for this vulnerability.
Affected products
- meshtastic firmware: from 2.5.0 before 2.5.19 — fixed in 2.5.19
How to fix
Upgrade to a fixed version: meshtastic firmware 2.5.19. Check the vendor advisory for mitigations.
References
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