CVE-2025-21608

Forged packets over MQTT can show up in direct messages in Meshtastic firmware

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.

Category

5.3
CVSS
Severity: Medium
CVSS 4.0 •
EPSS 0.03%
Affected: meshtastic firmware
Published at:
Updated at:

References

Link Tags
https://github.com/meshtastic/firmware/security/advisories/GHSA-c967-qc39-3hf5

Frequently Asked Questions

What is the severity of CVE-2025-21608?
CVE-2025-21608 has been scored as a medium severity vulnerability.
How to fix CVE-2025-21608?
To fix CVE-2025-21608, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-21608 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-21608 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-21608?
CVE-2025-21608 affects meshtastic firmware.
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