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Fencer Vulns
low 3.3

CVE-2021-3588 json

memory contents disclosure in cli_feat_read_cb

published 2021-06-10 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-26896

cvss
3.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 39%
public exploits
0
none known

Summary

The cli_feat_read_cb() function in src/gatt-database.c does not perform bounds checks on the 'offset' variable before using it as an index into an array for reading.

Patch / fix

  • BlueZ BlueZ 5.56
  • bluez Debian 14, Debian 13, Debian 12 5.55-3.1

debian advisories DEBIAN-CVE-2021-3588

  • bluez Ubuntu 20.04 LTS 5.53-0ubuntu3.2

ubuntu advisories UBUNTU-CVE-2021-3588

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • bluez SLE Workstation Extension 15 SP3, SLE Module for Desktop Applications 15 SP3, SLE Module for Basesystem 15 SP3 5.55-3.6.1

suse advisories SUSE-SU-2021:2459-1

  • bluez openSUSE Tumbleweed 5.65-4.1
  • bluez openSUSE Leap 15.3 5.55-3.6.1

opensuse advisories openSUSE-SU-2024:12446-1openSUSE-SU-2021:2459-1

  • bluez CBL-Mariner 2.0 5.63-1

azure linux advisories AZL-7183

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • bluez Arch Linux 5.56-1

arch linux advisories AVG-2061

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-3588 updated cvss 3.3

bluez: out-of-bounds read in cli_feat_read_cb() in src/gatt-database.c

  • Red Hat Enterprise Linux 6 bluez, bluez-alsa, bluez-cups, bluez-libs, bluez-compat, bluez-gstreamer Red Hat Enterprise Linux 7 bluez, bluez-cups, bluez-libs, bluez-hid2hci
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 bluez, bluez-cups, bluez-libs, bluez-obexd, bluez-hid2hci
    affected: no fix available
  • Red Hat Enterprise Linux 9 bluez, bluez-cups, bluez-libs, bluez-obexd
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/bluez/bluez/issues/70 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 3.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
NVD 3.1 3.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • BlueZ BlueZ

Classification

Weakness
  • CWE-788 Access of Memory Location After End of Buffer
  • CWE-125 Out-of-bounds Read

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.