CVE-2025-20680

Local privilege escalation via Bluetooth heap overflow

Published Jul 8, 2025 · Updated Feb 26, 2026

Heap-based buffer overflow in MediaTek's Bluetooth driver in NB SDK 3.6 and earlier allows local users to elevate privileges. The driver applies an incorrect bounds check before writing to heap memory, allowing the write to pass the buffer boundary. Exploitation requires existing User execution privileges, but no user interaction, and grants higher local privileges on affected MediaTek chipsets.

CVSS severity9.8
Critical
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in MediaTek's Bluetooth driver in NB SDK 3.6 and earlier allows local users to elevate privileges. The driver applies an incorrect bounds check before writing to heap memory, allowing the write to pass the buffer boundary. Exploitation requires existing User execution privileges, but no user interaction, and grants higher local privileges on affected MediaTek chipsets.

The record

CVE
CVE-2025-20680
Published
Jul 8, 2025
Updated
Feb 26, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-122, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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