CVE-2025-27840

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

1.34% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 69.3% of scored records. A rank, not a probability.

NVD base score

6.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2025-03-08 00:00Z1 YR AGO

Last updated

2025-05-12 15:33Z1 YR AGO

Reserved

2025-03-08

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Medium (CVSS 6.8)

CNA CVSS vector

CVSS:3.1/AV:P/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L

Weaknesses

• CWE-912Hidden FunctionalityClass

Data version

5.1

Document digest

b876169ca111ac1a64b8534b77e062ee9deb2f8cf609e9b2929282be7aecb9ed

• github.comhttps://github.com/TarlogicSecurity/Talks/blob/main/2025_RootedCon_BluetoothTools.pdf
• x.comhttps://x.com/pascal_gujer/status/1898442439704158276
• www.tarlogic.comhttps://www.tarlogic.com/news/backdoor-esp32-chip-infect-ot-devices/
• www.bleepingcomputer.comhttps://www.bleepingcomputer.com/news/security/undocumented-backdoor-found-in-bluetooth-chip-used-by-a-billion-devices/
• reg.rootedcon.comhttps://reg.rootedcon.com/cfp/schedule/talk/5
• flyingpenguin.comhttps://flyingpenguin.com/?p=67838
• github.comhttps://github.com/em0gi/CVE-2025-27840
• github.comhttps://github.com/orgs/espruino/discussions/7699
• www.bleepingcomputer.comhttps://www.bleepingcomputer.com/news/security/undocumented-commands-found-in-bluetooth-chip-used-by-a-billion-devices/
• darkmentor.comhttps://darkmentor.com/blog/esp32_non-backdoor/
• news.ycombinator.comhttps://news.ycombinator.com/item?id=43308740
• news.ycombinator.comhttps://news.ycombinator.com/item?id=43301369
• github.comhttps://github.com/esphome/esphome/discussions/8382
• cheriot.orghttps://cheriot.org/auditing/backdoor/2025/03/09/no-esp32-style-backdoor.html
• www.espressif.comhttps://www.espressif.com/en/news/Response_ESP32_Bluetooth