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CVE-2025-21608

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

MEDIUM
5.3
CVSS Score
Published: February 18, 2025 at 06:17 PM UTC
Updated: June 17, 2026 at 08:43 AM UTC
2 products affected across 1 vendorMeshtastic FirmwareMeshtastic

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Meshtastic Firmware· Meshtastic
95%
2.5.0 ≤ v < 2.5.19
Meshtastic· Meshtastic
60%
v ≤ 2.5.18

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://github.com/meshtastic/firmware/security/advisories/GHSA-c967-qc39-3hf5

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMGitHub_M
Vector?

Quick Info

StatusANALYZED
CWE
CWE-668

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