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Vulnerability record · CVE-2021-43400 · published 4 November 2021

CVE-2021-43400: Bluez use after free vulnerability

Bluez · Bluez

An issue was discovered in gatt-database.c in BlueZ 5.61. A use-after-free can occur when a client disconnects during D-Bus processing of a WriteValue call.

9.1 CVSS 3.1 Critical EPSS 1.7% · top 24.3% CWE-416 · Use after free
9.1CVSS 3.1 base score, v2 6.4
1.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
5References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in gatt-database.c in BlueZ 5.61. A use-after-free can occur when a client disconnects during D-Bus processing of a WriteValue call.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/pub/scm/bluetooth/bluez.git/commit/?id=838c0dc7641e1c991c0f3027bf94bee4606012f8 Mailing ListPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/10/msg00026.html Mailing ListThird Party Advisory
https://git.kernel.org/pub/scm/bluetooth/bluez.git/commit/?id=838c0dc7641e1c991c0f3027bf94bee4606012f8 Mailing ListPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/10/msg00026.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2024/09/msg00022.html

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Source: NIST National Vulnerability Database (record CVE-2021-43400), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.