---
id: CVE-2025-53627
title: Meshtastic is an open source mesh networking solution
summary: >-
  Meshtastic is an open source mesh networking solution. The Meshtastic firmware
  (starting from version 2.5) introduces asymmetric encryption (PKI) for direct
  messages, but when the `pki_encrypted` flag is missing, the firmware silently
  fa…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'
cwe:
  - CWE-1287
vendor: meshtastic
product: meshtastic_firmware
affected:
  - 'meshtastic_firmware >= 2.5.0, < 2.7.15'
patched:
  - meshtastic_firmware 2.7.15
published: '2025-12-29'
updated: '2026-10-05'
sourceUpdated: '2026-10-05T19:10:00.210'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-53627'
references:
  - url: >-
      https://github.com/meshtastic/firmware/security/advisories/GHSA-377p-prwp-4hwf
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.002
epssPercentile: 0.08863
ingestedAt: '2026-10-05T19:30:59.958Z'
---

## Overview

Meshtastic is an open source mesh networking solution. The Meshtastic firmware (starting from version 2.5) introduces asymmetric encryption (PKI) for direct messages, but when the `pki_encrypted` flag is missing, the firmware silently falls back to legacy AES-256-CTR channel encryption. This was an intentional decision to maintain backwards compatibility. However, the end-user applications, like Web app, iOS/Android app, and applications built on top of Meshtastic using the SDK, did not have a way to differentiate between end-to-end encrypted DMs and the legacy DMs. This creates a downgrade attack path where adversaries who know a shared channel key can craft and inject spoofed direct messages that are displayed as if they were PKC encrypted. Users are not given any feedback of whether a direct message was decrypted with PKI or with legacy symmetric encryption, undermining the expected security guarantees of the PKI rollout. Version 2.7.15 fixes this issue.

## Affected

- `meshtastic_firmware >= 2.5.0, < 2.7.15`

## Remediation

Upgrade past the affected range:

- `meshtastic_firmware 2.7.15`