CVE-2022-0204Public exploit

GATT server crash via wrapped prepare-write length

Published Mar 9, 2022 · Updated Apr 15, 2026

Heap overflow in BlueZ before 5.63 allows attackers on an adjacent Bluetooth link to crash a GATT server with crafted prepare writes. In src/shared/gatt-server.c, append_prep_data stores the accumulated length in a 16-bit value, allowing it to wrap before realloc allocates a too-small buffer and memcpy writes beyond it. The vulnerable path requires an exposed GATT attribute that permits prepare writes; the upstream report found no such attribute enabled by default on Ubuntu.

CVSS severity8.8
High
EPSS probability1.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap overflow in BlueZ before 5.63 allows attackers on an adjacent Bluetooth link to crash a GATT server with crafted prepare writes. In src/shared/gatt-server.c, append_prep_data stores the accumulated length in a 16-bit value, allowing it to wrap before realloc allocates a too-small buffer and memcpy writes beyond it. The vulnerable path requires an exposed GATT attribute that permits prepare writes; the upstream report found no such attribute enabled by default on Ubuntu.

The record

CVE
CVE-2022-0204
Published
Mar 9, 2022
Updated
Apr 15, 2026
Vendor
BlueZ Project
Product
BlueZ
Classifications
CWE-190, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 9, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 2026Record 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=bluez versions prior to 5.63

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

BlueZ Project · BlueZversion=bluez versions prior to 5.63

Published CVSS scores

8.8UbuntuCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1499Endpoint Denial of Service

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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