CVE-2023-28909Public exploit

Code execution via fragmented HCI length overflow

Published Jun 28, 2025 · Updated Jun 30, 2025

Integer overflow in JOYNEXT MIB3 OI MQB 0304 and earlier allows physically proximate attackers to enable code execution via fragmented HCI packets. In tsd.bt.phone.mib3, PHYLINK_ReassemblePacket adds each fragment length to pLink->rxLen without preventing integer wraparound, letting an undersized total pass the L2CAP MTU check. Bluetooth pairing and a second stack flaw are required to turn the bypass into code execution as the low-privileged phone user.

CVSS severity8.0
High
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in JOYNEXT MIB3 OI MQB 0304 and earlier allows physically proximate attackers to enable code execution via fragmented HCI packets. In tsd.bt.phone.mib3, PHYLINK_ReassemblePacket adds each fragment length to pLink->rxLen without preventing integer wraparound, letting an undersized total pass the L2CAP MTU check. Bluetooth pairing and a second stack flaw are required to turn the bypass into code execution as the low-privileged phone user.

The record

CVE
CVE-2023-28909
Published
Jun 28, 2025
Updated
Jun 30, 2025
Vendor
JOYNEXT GmbH
Product
JOYNEXT MIB3 OI MQB
Classifications
CWE-190, CAPEC-92, T1203
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 28, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 30, 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?

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

  1. Affected versionversion=0 <=0304

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

JOYNEXT GmbH · JOYNEXT MIB3 OI MQBversion=0 <=0304

Published CVSS scores

8.0Automotive Security Research GroupCVSS:3.1/AV:A/AC:L/PR:N/UI:R/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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
CAPEC-92Forced Integer Overflow
T1203Exploitation for Client Execution

Public exploit references

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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