What is CVE-2025-21608?

CVE-2025-21608 is a medium-severity vulnerability in Meshtastic Firmware, classified under Exposure of Resource to Wrong Sphere. CVSS score: 5.3/10. Published 2025-02-18.

How severe is CVE-2025-21608?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Meshtastic Firmware

CVE-2025-21608

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.

EPSS: 0.004 (29.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

Affected products

Meshtastic Firmware — versions >= 2.5.0, <= 2.5.18
Meshtastic Meshtastic_firmware

Weakness classification (CWE)

CWE-668 — Exposure of Resource to Wrong Sphere

References

security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)

Frequently asked questions

What is CVE-2025-21608?: CVE-2025-21608 is a medium-severity vulnerability in Meshtastic Firmware, classified under Exposure of Resource to Wrong Sphere. CVSS score: 5.3/10. Published 2025-02-18.
How severe is CVE-2025-21608?: Medium severity. CVSS v3 base score is 5.3 out of 10.