Forged packets over MQTT can show up in direct messages in Meshtastic firmware
Priority LOW 30CWE-668Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00372 31st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| meshtastic | firmware | 2.5.0 – 2.5.18 | — | No fix listed | CNA |
- firmware Vendormeshtastic Affected 2.5.0 – 2.5.18 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:meshtastic:meshtastic_firmware:*:*:*:*:*:*:*:* | 2.5.0 to before 2.5.19 | Vulnerable | meshtastic |
- cpe:2.3:o:meshtastic:meshtastic_firmware:*:*:*:*:*:*:*:* Versions 2.5.0 to before 2.5.19 Vulnerable ·meshtastic
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-21608
References
More Meshtastic Firmware vulnerabilities
- TI-2025-34949 Meshtastic allows crafting of specific NodeInfo packets that overwrite any publicKey saved in the NodeDB CVSS 3.1CRITICAL 9.8
- TI-2025-34948 In Meshtastic, an attacker can spoof licensed amateur flag for a node CVSS 3.1HIGH 8.2
- TI-2024-34421 Failure to check for packets from the broadcast address allows potential DDoS… CVSS 3.1HIGH 7.5
- TI-2025-33563 Meshtastic allows Command Injection in GitHub Action CVSS 3.1HIGH 8.0
- TI-2025-18515 Meshtastic crashes via an unimplemented routing module reply CVSS 3.1MEDIUM 6.5
- TI-2025-33554 Meshtastic firmware allows forged DMs with no PKC to show up as encrypted CVSS 3.1MEDIUM 5.3
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences