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Fencer Vulns
medium 6.5

CVE-2019-8921 json

An issue was discovered in bluetoothd in BlueZ through 5.48.

published 2021-11-29 4 y ago modified 2026-06-17 4 mo ago also EUVD-2019-18309

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 63%
public exploits
0
none known

Summary

An issue was discovered in bluetoothd in BlueZ through 5.48. The vulnerability lies in the handling of a SVC_ATTR_REQ by the SDP implementation. By crafting a malicious CSTATE, it is possible to trick the server into returning more bytes than the buffer actually holds, resulting in leaking arbitrary heap data. The root cause can be found in the function service_attr_req of sdpd-request.c. The server does not check whether the CSTATE data is the same in consecutive requests, and instead simply trusts that it is the same.

Patch / fix

  • bluez Debian 14, Debian 13, Debian 12 5.54-1

debian advisories DEBIAN-CVE-2019-8921

  • bluez Ubuntu 18.04 LTS 5.48-0ubuntu3.6
  • bluez Ubuntu Pro 16.04 LTS 5.37-0ubuntu5.3+esm5

ubuntu advisories UBUNTU-CVE-2019-8921

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 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +7 more 5.13-5.31.1
  • bluez SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +6 more 5.48-150200.13.17.1
  • bluez SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +7 more 5.48-150000.5.41.1

suse advisories SUSE-SU-2022:3718-1SUSE-SU-2022:3691-1SUSE-SU-2022:3687-1

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-2019-8921 updated cvss 6.5

bluez: information leak in service_attr_req() in sdpd-request.c via a crafted CSTATE

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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

1.01% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • ssd-disclosure.com https://ssd-disclosure.com/ssd-advisory-linux-bluez-information-leak-and-heap-overflow/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 3.1 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA 3.1 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 3.3 AV:A/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness
  • CWE-345 Insufficient Verification of Data Authenticity

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.