CVE-2025-20694

Adjacent device crash via Bluetooth firmware underflow

Published Jul 8, 2025 · Updated Jul 14, 2025

Buffer underflow in MediaTek Bluetooth firmware allows physically proximate attackers to crash affected Android and OpenWrt devices. The vendor identifies a buffer underflow that raises an uncaught exception but has not disclosed the affected routine or triggering input. No credentials or user interaction are required, and successful exploitation interrupts availability by crashing the device; confidentiality and integrity are unaffected.

CVSS severity6.5
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

Buffer underflow in MediaTek Bluetooth firmware allows physically proximate attackers to crash affected Android and OpenWrt devices. The vendor identifies a buffer underflow that raises an uncaught exception but has not disclosed the affected routine or triggering input. No credentials or user interaction are required, and successful exploitation interrupts availability by crashing the device; confidentiality and integrity are unaffected.

The record

CVE
CVE-2025-20694
Published
Jul 8, 2025
Updated
Jul 14, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-124, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 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 vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:A/AC:L/PR:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-124Buffer Underwrite ('Buffer Underflow')
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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