CVE-2023-23609

Memory corruption via unchecked BLE-L2CAP reassembly

Published Jan 25, 2023 · Updated Mar 11, 2025

Out-of-bounds write in Contiki-NG 4.8 and earlier allows physically proximate attackers to corrupt memory via fragmented BLE-L2CAP packets. The BLE-L2CAP input_l2cap_frame_flow_channel() reassembly path appends fragments to packetbuf without checking its remaining capacity. Reachability requires Bluetooth Low Energy proximity, and the write can extend up to 1152 bytes beyond the default packet buffer.

CVSS severity8.2
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Contiki-NG 4.8 and earlier allows physically proximate attackers to corrupt memory via fragmented BLE-L2CAP packets. The BLE-L2CAP input_l2cap_frame_flow_channel() reassembly path appends fragments to packetbuf without checking its remaining capacity. Reachability requires Bluetooth Low Energy proximity, and the write can extend up to 1152 bytes beyond the default packet buffer.

The record

CVE
CVE-2023-23609
Published
Jan 25, 2023
Updated
Mar 11, 2025
Vendor
Contiki-NG
Product
Contiki-NG
Classifications
CWE-787
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 25, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 11, 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=<= 4.8

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Contiki-NG · Contiki-NGversion=<= 4.8

Published CVSS scores

7.4NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
8.2GitHub, Inc.CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L

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-787Out-of-bounds Write

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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