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Fencer Vulns
high 8.6

CVE-2020-27153 json

In BlueZ before 5.55, a double free was found in the gatttool disconnect_cb() routine from shared/att.c.

published 2020-10-15 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-19677

cvss
8.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
4.3%
EPSS 4.3% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

In BlueZ before 5.55, a double free was found in the gatttool disconnect_cb() routine from shared/att.c. A remote attacker could potentially cause a denial of service or code execution, during service discovery, due to a redundant disconnect MGMT event.

Patch / fix

  • bluez bluez 5.55
  • bluez Debian 14, Debian 13, Debian 12 5.55-1

debian advisories DEBIAN-CVE-2020-27153

  • bluez Ubuntu 18.04 LTS 5.48-0ubuntu3.5
  • bluez Ubuntu 20.04 LTS 5.53-0ubuntu3.2
  • bluez Ubuntu Pro 16.04 LTS 5.37-0ubuntu5.3+esm1

ubuntu advisories UBUNTU-CVE-2020-27153

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 RHEL 8 5.52-4.el8
  • bluez-cups RHEL 8 5.52-4.el8
  • bluez-libs RHEL 8 5.52-4.el8
  • bluez-obexd RHEL 8 5.52-4.el8
  • bluez-hid2hci RHEL 8 5.52-4.el8

red hat advisories RHSA-2021:1598

  • bluez SLE Workstation Extension 15 SP1, SLE Module for Desktop Applications 15 SP1, SLE Module for Basesystem 15 SP1 5.48-5.28.1
  • bluez SLE Workstation Extension 15 SP2, SLE Module for Desktop Applications 15 SP2, SLE Module for Basesystem 15 SP2 5.48-13.3.1

suse advisories SUSE-SU-2020:3165-1SUSE-SU-2020:3034-1

  • bluez openSUSE Leap 15.2 5.48-lp152.12.6.1
  • bluez openSUSE Leap 15.1 5.48-lp151.8.15.1

opensuse advisories openSUSE-SU-2020:1880-1openSUSE-SU-2020:1876-1

  • bluez Rocky Linux 8 5.52-4.el8

rocky linux advisories RLSA-2021:1598

  • bluez Alpine 3.10 5.50-r5
  • bluez Alpine 3.11 5.52-r2
  • bluez Alpine 3.12 5.54-r6
  • bluez Alpine 3.9 5.50-r2

alpine advisories ALPINE-CVE-2020-27153

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2020-27153 updated cvss 8.8

bluez: double free in gatttool client disconnect callback handler in src/shared/att.c could lead to DoS or RCE

  • Red Hat Enterprise Linux 5 bluez-gnome 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: workaround, no fix planned “Out of support scope”
  • Red Hat CodeReady Linux Builder (v. 8) bluez-debuginfo 5.52-4.el8, bluez-libs-devel 5.52-4.el8, bluez-debugsource 5.52-4.el8, bluez-cups-debuginfo 5.52-4.el8, bluez-libs-debuginfo 5.52-4.el8, bluez-obexd-debuginfo 5.52-4.el8, +1 more Red Hat Enterprise Linux AppStream (v. 8) bluez-cups 5.52-4.el8 Red Hat Enterprise Linux BaseOS (v. 8) bluez 5.52-4.el8, bluez-libs 5.52-4.el8, bluez-obexd 5.52-4.el8, bluez-hid2hci 5.52-4.el8
    fixed: vendor fix RHSA-2021:1598

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
yes
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

4.29% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
NVD 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
CNA 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

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.