CVE-2019-9506

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3%CVSS: 8.1Exploit: Elevated riskExposed: 0

A fix is available — apply it.

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 v3
8.1
EG Score
8.1(medium)
EG Risk
57(Track)
EG Risk 57/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity81% × 45%
Exploitation40% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
3%
EPSS %ILE
85%
KEV
Not listed

Published

August 14, 2019

Last Modified

November 21, 2024

Advisory Details (8)

Auto-updated Sep 12, 2026
Patch available. Sources: redhat.
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2019:3055
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.5 Extended Update Support.

https://access.redhat.com/errata/RHSA-2019:2975
generic

Security Advisory - Key Negotiation of Bluetooth (KNOB) Vulnerability

http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20190828-01-knob-en
generic

Department of Computer Science, University of Oxford: Publication - The KNOB is Broken: Exploiting Low Entropy in the Encryption Key Negotiation Of Bluetooth BR/EDR

http://www.cs.ox.ac.uk/publications/publication12404-abstract.html
generic

Full Disclosure: APPLE-SA-2019-8-13-4 Additional information for APPLE-SA-2019-7-22-5 tvOS 12.4

http://seclists.org/fulldisclosure/2019/Aug/15
generic

Full Disclosure: APPLE-SA-2019-8-13-3 Additional information for APPLE-SA-2019-7-22-4 watchOS 5.3

http://seclists.org/fulldisclosure/2019/Aug/14
generic

Full Disclosure: APPLE-SA-2019-8-13-2 Additional information for APPLE-SA-2019-7-22-1 iOS 12.4

http://seclists.org/fulldisclosure/2019/Aug/13
generic

Full Disclosure: 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

http://seclists.org/fulldisclosure/2019/Aug/11

Patch Availability(16)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-image-virtual-hwe-16.04 (4.15.0.60.81) @ xenial2026-05-27ubuntu
ubuntulinux-image-virtual (5.0.0.31.32) @ disco2026-05-27ubuntu
ubuntulinux-image-aws-hwe (4.15.0.1047.47) @ xenial2026-05-27ubuntu
redhatkernel-0:3.10.0-327.86.1.el72020-04-14redhat
redhatkernel-0:4.18.0-80.15.1.el8_02020-01-22redhat
redhatkernel-rt-0:4.18.0-147.rt24.93.el82019-11-05redhat
redhatkernel-0:4.18.0-147.el82019-11-05redhat
redhatkernel-alt-0:4.14.0-115.14.1.el7a2019-10-29redhat
redhatkpatch-patch2019-10-29redhat
redhatkernel-0:3.10.0-514.70.1.el72019-10-29redhat
redhatkernel-0:3.10.0-957.38.1.el72019-10-29redhat
redhatkernel-0:3.10.0-693.60.1.el72019-10-24redhat
redhatkernel-rt-1:3.10.0-693.60.1.rt56.654.el6rt2019-10-22redhat
redhatkernel-0:3.10.0-1062.4.1.el72019-10-16redhat
redhatkernel-rt-0:3.10.0-1062.4.1.rt56.1027.el72019-10-16redhat
redhatkernel-0:3.10.0-862.43.1.el72019-10-08redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(6 across 5 ecosystems)
Debian:8(2)
PackageVulnerable rangeFixed inDependents
linux3.16.36-1 ... 3.16.72-1 (67 versions)3.16.74-1—
linux-4.94.9.110-1~deb8u1, 4.9.144-3.1~deb8u1, 4.9.168-1~deb8u14.9.189-3~deb8u1—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux—5.2.6-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux—5.2.6-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux—5.2.6-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux—5.2.6-1—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(18)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 4× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 137 total refreshes for this CVE.

  1. 2026-09-18 19:23 UTCEPSS rescore
  2. 2026-09-17 19:22 UTCEPSS rescore
  3. 2026-09-16 14:04 UTCEPSS rescore
  4. 2026-09-15 03:06 UTCEPSS rescore
  5. 2026-09-12 14:56 UTCEPSS rescore
  6. 2026-09-11 14:48 UTCEPSS rescore
  7. 2026-09-11 09:32 UTCEPSS rescore
  8. 2026-09-08 21:55 UTCEPSS rescore
  9. 2026-09-08 06:22 UTCOSV refresh
  10. 2026-09-07 15:57 UTCEPSS rescore
  11. 2026-09-06 13:44 UTCEPSS rescore
  12. 2026-09-05 15:24 UTCEPSS rescore
  13. 2026-09-04 13:56 UTCEPSS rescore
  14. 2026-09-02 14:08 UTCEPSS rescore
  15. 2026-09-01 03:32 UTCEPSS rescore
  16. 2026-08-30 01:18 UTCEPSS rescore
  17. 2026-08-27 14:21 UTCEPSS rescore
  18. 2026-08-26 14:42 UTCEPSS rescore
  19. 2026-08-25 13:45 UTCEPSS rescore
  20. 2026-08-21 16:44 UTCOSV refresh
  21. 2026-08-19 17:00 UTCEPSS rescore
  22. 2026-08-18 13:44 UTCEPSS rescore
  23. 2026-08-17 13:43 UTCEPSS rescore
  24. 2026-08-15 01:26 UTCEPSS rescore
  25. 2026-08-13 21:57 UTCEPSS rescore
Show 75 more
  1. 2026-08-12 13:47 UTCEPSS rescore
  2. 2026-08-09 13:43 UTCEPSS rescore
  3. 2026-08-08 16:33 UTCEPSS rescore
  4. 2026-08-07 16:23 UTCEPSS rescore
  5. 2026-08-06 01:54 UTCOSV refresh
  6. 2026-08-05 19:13 UTCEPSS rescore
  7. 2026-08-04 15:05 UTCEPSS rescore
  8. 2026-08-04 10:34 UTCEPSS rescore
  9. 2026-08-03 10:32 UTCEPSS rescore
  10. 2026-08-02 02:23 UTCEPSS rescore
  11. 2026-08-01 04:12 UTCEPSS rescore
  12. 2026-07-30 16:24 UTCEPSS rescore
  13. 2026-07-30 01:27 UTCEPSS rescore
  14. 2026-07-28 15:32 UTCEPSS rescore
  15. 2026-07-26 14:51 UTCEPSS rescore
  16. 2026-07-25 14:14 UTCEPSS rescore
  17. 2026-07-24 14:14 UTCEPSS rescore
  18. 2026-07-23 14:15 UTCEPSS rescore
  19. 2026-07-23 01:47 UTCEG score recompute
  20. 2026-07-22 22:30 UTCEG score recompute
  21. 2026-07-22 14:05 UTCEPSS rescore
  22. 2026-07-21 15:22 UTCEPSS rescore
  23. 2026-07-21 15:22 UTCEPSS rescore
  24. 2026-07-20 17:04 UTCEPSS rescore
  25. 2026-07-20 09:32 UTCOSV refresh
  26. 2026-07-19 14:28 UTCEPSS rescore
  27. 2026-07-19 14:28 UTCEPSS rescore
  28. 2026-07-19 02:26 UTCEPSS rescore
  29. 2026-07-19 02:26 UTCEPSS rescore
  30. 2026-07-18 10:02 UTCEPSS rescore
  31. 2026-07-16 16:59 UTCEPSS rescore
  32. 2026-07-16 16:59 UTCEPSS rescore
  33. 2026-07-15 16:55 UTCEPSS rescore
  34. 2026-07-15 01:57 UTCEPSS rescore
  35. 2026-07-13 22:27 UTCEPSS rescore
  36. 2026-07-13 22:27 UTCEPSS rescore
  37. 2026-07-13 06:10 UTCEPSS rescore
  38. 2026-07-13 06:10 UTCEPSS rescore
  39. 2026-07-12 05:44 UTCEPSS rescore
  40. 2026-07-12 05:43 UTCEPSS rescore
  41. 2026-07-11 08:24 UTCEPSS rescore
  42. 2026-07-11 08:24 UTCEPSS rescore
  43. 2026-07-09 19:06 UTCEPSS rescore
  44. 2026-07-08 15:11 UTCEPSS rescore
  45. 2026-07-07 13:43 UTCEPSS rescore
  46. 2026-07-06 16:25 UTCEPSS rescore
  47. 2026-07-06 16:25 UTCEPSS rescore
  48. 2026-07-06 02:20 UTCEPSS rescore
  49. 2026-07-06 02:20 UTCEPSS rescore
  50. 2026-07-05 02:27 UTCEPSS rescore
  51. 2026-07-04 06:28 UTCEPSS rescore
  52. 2026-07-03 04:35 UTCOSV refresh
  53. 2026-07-01 15:03 UTCEPSS rescore
  54. 2026-07-01 15:03 UTCEPSS rescore
  55. 2026-06-30 23:20 UTCEPSS rescore
  56. 2026-06-29 14:03 UTCEPSS rescore
  57. 2026-06-28 04:54 UTCEPSS rescore
  58. 2026-06-28 04:54 UTCEPSS rescore
  59. 2026-06-27 03:06 UTCEPSS rescore
  60. 2026-06-25 13:47 UTCEPSS rescore
  61. 2026-06-25 13:47 UTCEPSS rescore
  62. 2026-06-24 14:03 UTCEPSS rescore
  63. 2026-06-24 14:03 UTCEPSS rescore
  64. 2026-06-22 14:23 UTCEPSS rescore
  65. 2026-06-22 14:23 UTCEPSS rescore
  66. 2026-06-21 14:54 UTCEPSS rescore
  67. 2026-06-21 14:54 UTCEPSS rescore
  68. 2026-06-21 01:57 UTCEPSS rescore
  69. 2026-06-21 01:57 UTCEPSS rescore
  70. 2026-06-19 19:23 UTCEPSS rescore
  71. 2026-06-19 19:23 UTCEPSS rescore
  72. 2026-06-18 17:50 UTCEPSS rescore
  73. 2026-06-18 17:50 UTCEPSS rescore
  74. 2026-06-17 17:50 UTCEPSS rescore
  75. 2026-06-16 17:50 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCfrancozappa/knob
    First seen Aug 15, 2019

    Key Negotiation Of Bluetooth (KNOB) attacks on Bluetooth BR/EDR and BLE [CVE-2019-9506]

    Open source ↗

Frequently asked(5)

What is CVE-2019-9506?
CVE-2019-9506 is a high vulnerability published on August 14, 2019. 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…
When was CVE-2019-9506 disclosed?
CVE-2019-9506 was first published in the National Vulnerability Database on August 14, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-9506 actively exploited?
CVE-2019-9506 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3% probability of exploitation in the next 30 days, which ranks it in the top 14.8% of all scored CVEs.
What is the CVSS score of CVE-2019-9506?
CVE-2019-9506 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2019-9506?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-9506, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2019-9506

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