CVE-2025-20677

Local system crash via null pointer dereference

Published Jun 2, 2025 · Updated Jun 3, 2025

Null pointer dereference in MediaTek Bluetooth drivers in NB SDK release 3.6 and earlier allows local users to crash the system. The driver dereferences a null pointer and leaves the resulting exception uncaught, but MediaTek has not disclosed the specific code path or triggering input. Exploitation requires local User execution privileges and no user interaction; the documented consequence is an availability-only system crash.

CVSS severity5.5
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in MediaTek Bluetooth drivers in NB SDK release 3.6 and earlier allows local users to crash the system. The driver dereferences a null pointer and leaves the resulting exception uncaught, but MediaTek has not disclosed the specific code path or triggering input. Exploitation requires local User execution privileges and no user interaction; the documented consequence is an availability-only system crash.

The record

CVE
CVE-2025-20677
Published
Jun 2, 2025
Updated
Jun 3, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 2, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 3, 2025Record 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

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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