CVE-2025-53627: medium-severity vulnerability in meshtastic firmware
Meshtastic firmware allows forged DMs with no PKC to show up as encrypted
Published
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3epss 0.2%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Affected products
meshtastic · firmwareRelated CVEs — meshtastic firmware
In the same product, most dangerous first.
CVE-2026-44359CRITICALMeshtastic GitHub repo vulnerable to Arbitrary Code Execution via pull_request_target Fork Checkout in CI WorkflowEPSS 1.8%CVE-2025-24797CRITICALMeshtastic incorrectly hands malformed packets leads to controlled buffer overflowEPSS 0.9%CVE-2024-45038HIGHDevice crash via malformed MQTT packet when downlink is enabled in Meshtastic device firmwareEPSS 0.6%CVE-2025-52464CRITICALMeshtastic Repeated Public and Private KeypairsEPSS 0.6%CVE-2026-42566HIGHMeshtastic: Malformed UTF-8 in User.long_name broadcast over LoRa causes mesh-wide client decode failureEPSS 0.5%CVE-2025-55293CRITICALMeshtastic allows crafting of specific NodeInfo packets that overwrite any publicKey saved in the NodeDBEPSS 0.5%