CVE-2025-21608: meshtastic Resource Exposure (CVSS 5.3)

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.

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CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Weakness Type (CWE)

CWE-668 CWE-668

Affected Products

Vendor	Product	Versions
meshtastic	meshtastic_firmware	2.5.0 — 2.5.19

References

Other References

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

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2025-21608? +

CVE-2025-21608 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-21608? +

CVE-2025-21608 affects products from meshtastic, specifically: meshtastic_firmware. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-21608? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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