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What is CVE-2019-9506?A high-severity flaw in Android, explained.

High severity274 affected products
The short answer

CVE-2019-9506 is a high-severity flaw (CVSS 8.1) in Android from Google, published on 14 August 2019. It is not on the list of flaws known to be exploited today. The latest forecast puts its chance of use in the next 30 days at 2.7%. If you run an affected version, plan in the vendor’s fix.

Check if it affects you →How to fix it

Published 14 August 2019. Record last updated 4 November 2021. We keep this page's data up to date.

What it does

What is CVE-2019-9506? In plain terms.

An attacker has to be on the same local network without logging in, and nobody has to click anything. If it works, the attacker can read data and change data.

The official 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.

What kind of flaw is it?

  • CWE-327Use of a Broken or Risky Cryptographic Algorithm
CVSS 3.1 scoreHigh · 8.1

How an attack on it works

Read straight from its severity rating, translated out of the shorthand.

  • Where an attacker can beOn the same local network
  • How hard it is to pull offEasy: no special conditions
  • Login needed firstNo login needed
  • Does someone have to clickNo, nobody has to do anything
  • What an attacker getsCan read data and change data

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

Exploitation

Is CVE-2019-9506 being exploited? Not that we know of.

It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 2.7%. That can change at any time, which is why we keep watching.

Known to be exploitedNoNot on the list of exploited flaws today
Chance of use in the next 30 days2.7%Its EPSS score, from the latest forecast

Timeline

  1. Published
  2. Record last updated
How Precursor Intelligence ranks it
42out of 100Medium

CVE-2019-9506 scores 42. Action: Plan remediation.

We keep the score of every published flaw up to date as the evidence changes. Four things go into the score, and evidence that criminals are actually using it counts most. In order:

  • Evidence it is being exploitedBiggest factor
  • How severe it isStrong factor
  • How widely exposed it isSmaller factor
  • Threat activity around itSmaller factor

85 and above is Critical. Anything confirmed as exploited is always marked for an emergency patch, whatever its score.

When CVE-2019-9506 matches software you track, it lands in your list with its score and the reasons behind it.

See your own ranked list →
Affected products

Who is affected by CVE-2019-9506? 274 products.

The published record lists 274 products from 8 vendors. Versions are shown as published: "before 9.1.0.154(c185e2r5p1)" means every version up to, but not including, 9.1.0.154(c185e2r5p1). If you run one of these, check your version, then go to the fix below.

  • Operating system

    Android

    by Google

    Affected versions
    version not specified
  • Operating system

    Honor 20 Pro Firmware

    by Huawei

    Affected versions
    before 9.1.0.154(c185e2r5p1)before 9.1.0.154(c432e2r5p1)before 9.1.0.154(c636e2r3p1)before 9.1.0.155(c10e2r3p1)before 9.1.0.170(c185e2r5p1)before 9.1.0.170(c636e2r3p1)
  • Operating system

    Enterprise Linux Server Aus

    by Red Hat

    Affected versions
    7.37.47.67.78.28.4
  • Operating system

    Enterprise Linux Server Tus

    by Red Hat

    Affected versions
    7.37.47.67.78.28.4
  • Operating system

    Bla-L29c Firmware

    by Huawei

    Affected versions
    before 9.1.0.300(c605e2r1p12t8)before 9.1.0.306(c185e2r1p13t8)before 9.1.0.306(c432e4r1p11t8)before 9.1.0.306(c636e2r1p13t8)before 9.1.0.307(c635e4r1p13t8)
  • Operating system

    Charlotte-L29c Firmware

    by Huawei

    Affected versions
    before 9.1.0.311(c605e2r1p11t8)before 9.1.0.325(c185e4r1p11t8)before 9.1.0.325(c636e2r1p12t8)before 9.1.0.328(c432e5r1p9t8)before 9.1.0.328(c782e10r1p9t8)
  • Operating system

    Columbia-L29d Firmware

    by Huawei

    Affected versions
    before 9.1.0.350(c10e5r1p14t8)before 9.1.0.350(c185e3r1p12t8)before 9.1.0.350(c461e3r1p11t8)before 9.1.0.350(c636e3r1p13t8)before 9.1.0.351(c432e5r1p13t8)
  • Operating system

    Emily-L29c Firmware

    by Huawei

    Affected versions
    before 9.1.0.311(c461e2r1p11t8)before 9.1.0.325(c185e2r1p12t8)before 9.1.0.325(c636e7r1p13t8)before 9.1.0.326(c635e2r1p11t8)before 9.1.0.328(c432e7r1p11t8)
  • Operating system

    Enterprise Linux Eus

    by Red Hat

    Affected versions
    7.67.78.18.28.4
Remediation

How do I fix CVE-2019-9506? Four steps.

  1. Check whether you run itCompare your versions with the affected products above. Not sure what you run? Precursor Intelligence can work it out from your public website, or you can pick it from a list.
  2. Apply the vendor’s fixInstall the latest update from the vendor. The references list where the vendor has published details.
  3. If you can’t patch todayFollow any mitigation the vendor publishes, and limit who can reach the affected system from the internet until the update is in.
  4. Keep an eye on itTrack the product and we tell you as soon as we spot this flaw on the list of exploited flaws, or a jump in its exploit likelihood.

References

30 links
Precursor Intelligence

Does CVE-2019-9506 affect you? We'll keep checking.

Looking flaws up one at a time doesn't scale. Tell us what you run once, and we tell you which flaws matter to you, in what order, and keep watching for new ones.

  1. Tell us what you runPick your software from a list, or let us work it out from your website.
  2. We match it to every flawOver 400,000 published flaws, checked against your list.
  3. Ranked by real-world riskA 0 to 100 score, led by evidence criminals are using it.
  4. Told as soon as we knowAn alert by email, in the app or by webhook to your own tools.
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FAQ

Common questions, answered plainly.

Something else? Talk to the team →

CVE-2019-9506 is a high-severity flaw in Android from Google, published on 14 August 2019. An attacker has to be on the same local network without logging in, and nobody has to click anything. If it works, the attacker can read data and change data.

It scores 8.1 out of 10 on the CVSS severity scale, which is high. Our risk score for CVE-2019-9506 is 42 out of 100, which is Medium. Its action is "Plan remediation". No sign of exploitation and a low forecast. Patch it in your normal update cycle.

It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 2.7%. That can change at any time, which is why we keep watching.

For Android from Google: version not specified. The record lists 274 products in all, each with its versions, under "Who is affected" on this page.

Install the update the vendor names in its advisory. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet.

Keep exploring