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CVE-2019-9506
Blutooth BR/EDR specification does not specify sufficient encryption key length and allows an attacker to influence key length negotiation
- 7.6HighCVSS base score
- 2.9%Exploitation in 30 daysEPSS · top 13% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By certcc
- 6 months later
· 6 months later
Published
- 5 years later
· 5 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| certccCNA (assigner) | 3.0 | High7.6 | CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L |
| NVDNVD · Modified | 3.1 | High8.1 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
- EPSS (exploitation in 30 days)
- 2.9% · top 13% of all CVEs (10 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.6.
Affected products
What to do
Workaround: Bluetooth SIG Expedited Errata Correction 11838
References
30
- VU#918987 (opens in a new tab)third-party-advisoryx_refsource_CERT-VNx_transferred
- http://www.cs.ox.ac.uk/publications/publication12404-abstract.html (opens in a new tab)x_refsource_MISCx_transferred
- https://www.usenix.org/conference/usenixsecurity19/presentation/antonioli (opens in a new tab)x_refsource_MISCx_transferred
- https://www.bluetooth.com/security/statement-key-negotiation-of-bluetooth/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- 20190816 APPLE-SA-2019-8-13-3 Additional information for APPLE-SA-2019-7-22-4 watchOS 5.3 (opens in a new tab)mailing-listx_refsource_FULLDISCx_transferred
- 20190816 APPLE-SA-2019-8-13-1 Additional information for APPLE-SA-2019-7-22-2 macOS Mojave 10.14.6, Security Update 2019-004 High Sierra, Security Update 2019-004 Sierra (opens in a new tab)mailing-listx_refsource_FULLDISCx_transferred
- 20190816 APPLE-SA-2019-8-13-2 Additional information for APPLE-SA-2019-7-22-1 iOS 12.4 (opens in a new tab)mailing-listx_refsource_FULLDISCx_transferred
- 20190816 APPLE-SA-2019-8-13-4 Additional information for APPLE-SA-2019-7-22-5 tvOS 12.4 (opens in a new tab)mailing-listx_refsource_FULLDISCx_transferred
- http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20190828-01-knob-en (opens in a new tab)x_refsource_CONFIRMx_transferred
- USN-4115-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- USN-4118-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- [debian-lts-announce] 20190914 [SECURITY] [DLA 1919-1] linux-4.9 security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [debian-lts-announce] 20190915 [SECURITY] [DLA 1919-2] linux-4.9 security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [debian-lts-announce] 20190925 [SECURITY] [DLA 1930-1] linux security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- USN-4147-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- RHSA-2019:2975 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- openSUSE-SU-2019:2307 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- openSUSE-SU-2019:2308 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- RHSA-2019:3076 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2019:3055 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2019:3089 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2019:3187 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2019:3165 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2019:3217 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2019:3220 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2019:3231 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2019:3218 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2019:3309 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2019:3517 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2020:0204 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2019-18880 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2019-9506)Record last updated .