CVE-2025-27840
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.8epss 1.3%
exploitation probability
1.3%top 31% of all CVEs
observed exploitation
nono source reports it
Espressif ESP32 chips allow 29 hidden HCI commands, such as 0xFC02 (Write memory).
CVSS:3.1/AV:P/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L
Affected products
Espressif · ESP32References
https://cheriot.org/auditing/backdoor/2025/03/09/no-esp32-style-backdoor.htmlhttps://darkmentor.com/blog/esp32_non-backdoor/https://flyingpenguin.com/?p=67838https://github.com/em0gi/CVE-2025-27840https://github.com/esphome/esphome/discussions/8382https://github.com/orgs/espruino/discussions/7699https://github.com/TarlogicSecurity/Talks/blob/main/2025_RootedCon_BluetoothTools.pdfhttps://news.ycombinator.com/item?id=43301369https://news.ycombinator.com/item?id=43308740https://reg.rootedcon.com/cfp/schedule/talk/5https://www.bleepingcomputer.com/news/security/undocumented-backdoor-found-in-bluetooth-chip-used-by-a-billion-devices/https://www.bleepingcomputer.com/news/security/undocumented-commands-found-in-bluetooth-chip-used-by-a-billion-devices/