CVE-2024-20139

Proximate service interruption via Bluetooth firmware assertion

Published Dec 2, 2024 · Updated Dec 2, 2024

Reachable assertion in MediaTek Bluetooth firmware allows physically proximate attackers to interrupt service on affected chipsets. Improper handling of an exceptional condition reaches a firmware assertion, but MediaTek has not disclosed the triggering input or code locus. No privileges or user interaction are required, and exploitation is limited to an availability loss caused by the firmware assert.

CVSS severity6.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in MediaTek Bluetooth firmware allows physically proximate attackers to interrupt service on affected chipsets. Improper handling of an exceptional condition reaches a firmware assertion, but MediaTek has not disclosed the triggering input or code locus. No privileges or user interaction are required, and exploitation is limited to an availability loss caused by the firmware assert.

The record

CVE
CVE-2024-20139
Published
Dec 2, 2024
Updated
Dec 2, 2024
Vendor
MediaTek
Product
MediaTek MT7925
Classifications
CWE-617, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 2, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=*

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

MediaTek · MediaTek MT7925version=0 <=*
MediaTek · MT6990version=0 <=*
MediaTek · MediaTek MT8678version=0 <=*
MediaTek · MT8532version=0 <=*
MediaTek · MT8518Sversion=0 <=*
MediaTek · MT3605version=0 <=*
MediaTek · MediaTek MT7927version=0 <=*
MediaTek · MT2737version=0 <=*
MediaTek · MT6985version=0 <=*
MediaTek · MT6989version=0 <=*

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-617Reachable Assertion
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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