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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

Quick assessment

Affected
Bluetooth BR/EDR
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Bluetooth BR/EDR是一种蓝牙BR/EDR（基本速率/增强数据速率）标准。 Bluetooth BR/EDR 5.1及之前版本中存在加密问题漏洞。该漏洞源于网络系统或产品未正确使用相关密码算法，导致内容未正确加密、弱加密、明文存储敏感信息等。

AI Predicted 7.4 Difficulty: Easy EPSS 2.69% · P85
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I. Basic Information for CVE-2019-9506

Vulnerability Information
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Vulnerability Title
Blutooth BR/EDR specification does not specify sufficient encryption key length and allows an attacker to influence key length negotiation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
加密问题
Source: CVE Program / CVE List V5
Vulnerability Title
Bluetooth BR/EDR 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Bluetooth BR/EDR是一种蓝牙BR/EDR（基本速率/增强数据速率）标准。 Bluetooth BR/EDR 5.1及之前版本中存在加密问题漏洞。该漏洞源于网络系统或产品未正确使用相关密码算法，导致内容未正确加密、弱加密、明文存储敏感信息等。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Bluetooth BR/EDR 5.1 ~ 5.1 -

II. Public POCs for CVE-2019-9506

# POC Description Source Link Shenlong Link
1 Key Negotiation Of Bluetooth (KNOB) attacks on Bluetooth BR/EDR and BLE [CVE-2019-9506] https://github.com/francozappa/knob POC Details
2 Key Negotiation Of Bluetooth (KNOB) attacks on Bluetooth BR/EDR and BLE [CVE-2019-9506] https://github.com/coffeeesd/knob POC Details
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III. Intelligence Information for CVE-2019-9506

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Vendor Advisories for CVE-2019-9506 (17)

Mailing List Discussions for CVE-2019-9506 (9)

Other References for CVE-2019-9506 (4)

IV. Related Vulnerabilities

Same product: BR/EDR
Same vendor: Bluetooth
Same weakness: CWE-310

V. Comments for CVE-2019-9506

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