{"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","slug":"CVE-2025-53627","body":"## Overview\n\nMeshtastic 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.\n\n## Affected\n\n- `meshtastic_firmware >= 2.5.0, < 2.7.15`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `meshtastic_firmware 2.7.15`","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}