CVE-2026-83777

8.8High

Published 13 Oct 2026 · NVD status: Awaiting Analysis · AI triage by gemini-3.8-flash

8.8High

Attack vector: Adjacent network
Complexity: Low
Privileges needed: None
User interaction: None
Impact: Full C/I/A compromise
Weakness: CWE-122

Impact

An adjacent unauthorized attacker can elevate privileges to take full control of the system. They must be within physical Bluetooth/adjacent network range of the target.

Root cause

A heap-based buffer overflow in the Windows Bluetooth Service improperly handles memory allocation during adjacent network interactions.

Affected systems

Versions not listed — check the vendor advisory.

CVSS v3.1 · CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Fix & remediation

Install the Microsoft security update for CVE-2026-83777 from the MSRC advisory. If patching must wait, disable the Windows Bluetooth Support Service (bthserv) or shut off the Bluetooth radio.

shell

$ Stop-Service -Name bthserv -PassThru; Set-Service -Name bthserv -StartupType Disabled

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD description

Heap-based buffer overflow in Windows Bluetooth Service allows an unauthorized attacker to elevate privileges over an adjacent network.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83777

Source: nvd.nist.gov/vuln/detail/CVE-2026-83777