CVE-2020-27153

Severity: high (CVSS 8.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-10-15 · updated 2026-06-17
Weakness: CWE-415

Description

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.

Affected products

BlueZ: before 5.55 — fixed in 5.55
Debian Linux: 9.0, 10.0
openSUSE Leap: 15.1, 15.2

How to fix

Upgrade to a fixed version: BlueZ 5.55. Check the vendor advisory for mitigations.

References

http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00034.html
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00036.html
https://bugzilla.redhat.com/show_bug.cgi?id=1884817
https://github.com/bluez/bluez/commit/1cd644db8c23a2f530ddb93cebed7dacc5f5721a
https://github.com/bluez/bluez/commit/5a180f2ec9edfacafd95e5fed20d36fe8e077f07
https://lists.debian.org/debian-lts-announce/2020/10/msg00022.html
https://security.gentoo.org/glsa/202011-01
https://www.debian.org/security/2021/dsa-4951
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00034.html
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00036.html
https://bugzilla.redhat.com/show_bug.cgi?id=1884817
https://github.com/bluez/bluez/commit/1cd644db8c23a2f530ddb93cebed7dacc5f5721a

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