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Vulnerability record · CVE-2019-9506 · published 14 August 2019

CVE-2019-9506: Google android broken cryptographic algorithm vulnerability

Google · Android

The Bluetooth BR/EDR specification up to and including version 5.1 permits sufficiently low encryption key length and does not prevent an attacker from influencing the key length negotiation. This allows practical brute-force attacks (aka "KNOB") that can decrypt traffic and inject arbitrary ciphertext without the victim noticing.

8.1 CVSS 3.1 High EPSS 2.7% · top 14.7% CWE-310 · CWE-310CWE-327 · Broken cryptographic algorithm
8.1CVSS 3.1 base score, v2 4.8
2.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
147Affected product versions listed by NVD
60References
17 Jun 2026Last modified by NVD

Description

The Bluetooth BR/EDR specification up to and including version 5.1 permits sufficiently low encryption key length and does not prevent an attacker from influencing the key length negotiation. This allows practical brute-force attacks (aka "KNOB") that can decrypt traffic and inject arbitrary ciphertext without the victim noticing.

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

Affected products

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

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00036.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00037.html Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2019/Aug/11 Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2019/Aug/13 Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2019/Aug/14 Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2019/Aug/15 Mailing ListThird Party Advisory
http://www.cs.ox.ac.uk/publications/publication12404-abstract.html Third Party Advisory
http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20190828-01-knob-en Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2975 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3055 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3076 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3089 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3165 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3187 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3217 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3218 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3220 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3231 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3309 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3517 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0204 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/09/msg00014.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/09/msg00015.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/09/msg00025.html Mailing ListThird Party Advisory
https://usn.ubuntu.com/4115-1/ Third Party Advisory
https://usn.ubuntu.com/4118-1/ Third Party Advisory
https://usn.ubuntu.com/4147-1/ Third Party Advisory
https://www.bluetooth.com/security/statement-key-negotiation-of-bluetooth/ Third Party Advisory
https://www.kb.cert.org/vuls/id/918987/ Third Party AdvisoryUS Government Resource
https://www.usenix.org/conference/usenixsecurity19/presentation/antonioli Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00036.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00037.html Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2019/Aug/11 Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2019/Aug/13 Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2019/Aug/14 Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2019/Aug/15 Mailing ListThird Party Advisory
http://www.cs.ox.ac.uk/publications/publication12404-abstract.html Third Party Advisory
http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20190828-01-knob-en Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2975 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3055 Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-9506), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.