Asymmetric Encryption Vulnerability in Meshtastic Firmware by Meshtastic
CVE-2025-53627

5.3MEDIUM

Key Information:

Vendor

Meshtastic

Status
Firmware
Vendor
CVE Published:
29 December 2025

What is CVE-2025-53627?

The Meshtastic firmware, a popular open source solution for mesh networking, introduces asymmetric encryption for direct messages. However, if the required 'pki_encrypted' flag is missing, the system defaults to a less secure AES-256-CTR encryption method, which poses a significant risk. This design choice aimed at maintaining backward compatibility allows adversaries with knowledge of the shared channel key to exploit a downgrade attack. Compromised direct messages may appear as if they were secured with PKI encryption due to a lack of user feedback distinguishing between encryption types. This oversight undermines the intended security enhancements of the PKI implementation and impacts user trust. The issue has been addressed in firmware version 2.7.15.

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Affected Version(s)

firmware >= 2.5, < 2.7.15

References

https://github.com/meshtastic/firmware/security/advisorie...
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CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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