# What is CVE-2023-24023?

> CVE-2023-24023 is a medium-severity flaw (CVSS 6.8) in Bluetooth Core Specification, published on 28 November 2023. 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 1.3%. If you run an affected version, plan in the vendor’s fix.

Canonical page: https://www.precursorintelligence.com/what-is/cve-2023-24023

## At a glance

- **Verdict:** Plan it in. No sign of exploitation and a low forecast. Patch it in your normal update cycle.
- **Precursor Intelligence risk score:** 25 out of 100 (Low); action: Monitor. Kept up to date as the evidence changes.
- **Severity:** Medium (CVSS 6.8 out of 10)
- **Known to be exploited:** No, not on the list of flaws known to be exploited today
- **Chance of use in the next 30 days:** 1.3% (latest exploit-likelihood forecast)
- **Published:** 28 November 2023
- **Record last updated:** 1 August 2024
- **Main product:** Bluetooth Core Specification
- **Affected products:** 10

## What is CVE-2023-24023? 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

Bluetooth BR/EDR devices with Secure Simple Pairing and Secure Connections pairing in Bluetooth Core Specification 4.2 through 5.4 allow certain man-in-the-middle attacks that force a short key length, and might lead to discovery of the encryption key and live injection, aka BLUFFS.

### What kind of flaw is it?

- Unknown: Unknown

### How an attack on it works

- Where an attacker can be: On the same local network
- How hard it is to pull off: Hard: conditions must line up
- Login needed first: No login needed
- Does someone have to click: No, nobody has to do anything
- What an attacker gets: Can read data and change data

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

## Is CVE-2023-24023 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 1.3%. That can change at any time, which is why we keep watching.

Exploit likelihood over the last 7 days: 1.3%, 1.3%, 1.3%, 1.3%, 1.3%, 1.3%, 1.3%.

### Timeline

- 28 November 2023: Published
- 1 August 2024: Record last updated

### How Precursor Intelligence ranks it

CVE-2023-24023 scores **25 out of 100 (Low)**, with the action "Monitor".

Every published flaw gets a risk score from 0 to 100, kept up to date as the evidence changes. Four things go into the score, from the one that counts most to the ones that count less:

- Evidence it is being exploited: biggest factor
- How severe it is: strong factor
- How widely exposed it is: key context
- Real threat activity around it: key context

85 and above is Critical. Anything confirmed as exploited is always marked for an emergency patch, whatever its score. When this flaw matches software you track, it lands in your list with its score and the reasons behind it.

## Who is affected by CVE-2023-24023?

The published record lists 10 products. Versions are as published: "before 10.0.17763.5122" means every version up to, but not including, 10.0.17763.5122.

- [Bluetooth Core Specification](https://www.precursorintelligence.com/product/bluetooth/bluetooth_core_specification) by [Bluetooth](https://www.precursorintelligence.com/vendors/bluetooth) (Application): 4.2 to 5.4
- [Windows 10 1809](https://www.precursorintelligence.com/product/microsoft/windows_10_1809) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): before 10.0.17763.5122
- [Windows 10 21H2](https://www.precursorintelligence.com/product/microsoft/windows_10_21h2) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): before 10.0.19043.3693
- [Windows 10 22H2](https://www.precursorintelligence.com/product/microsoft/windows_10_22h2) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): before 10.0.19045.3693
- [Windows 11 21H2](https://www.precursorintelligence.com/product/microsoft/windows_11_21h2) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): before 10.0.22000.2600
- [Windows 11 22H2](https://www.precursorintelligence.com/product/microsoft/windows_11_22h2) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): before 10.0.22621.2715
- [Windows 11 23H2](https://www.precursorintelligence.com/product/microsoft/windows_11_23h2) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): before 10.0.22631.2715
- [Windows Server 2019](https://www.precursorintelligence.com/product/microsoft/windows_server_2019) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): before 10.0.17763.5122
- [Windows Server 2022](https://www.precursorintelligence.com/product/microsoft/windows_server_2022) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): before 10.0.20348.2113
- [Windows Server 2022 23H2](https://www.precursorintelligence.com/product/microsoft/windows_server_2022_23h2) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): before 10.0.25398.531

## How do I fix CVE-2023-24023?

1. **Check whether you run it.** Compare 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 fix.** Install the update named in the vendor’s advisory. We’ve put the advisory first in the list.
3. **If you can’t patch today.** Follow 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 it.** Track 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

- [bluetooth.com](https://www.bluetooth.com/learn-about-bluetooth/key-attributes/bluetooth-security/bluffs-vulnerability/) (Vendor advisory)
- [dl.acm.org](https://dl.acm.org/doi/10.1145/3576915.3623066) (Technical description, Third-party advisory)

## Questions

### What is CVE-2023-24023?

CVE-2023-24023 is a medium-severity flaw in Bluetooth Core Specification, published on 28 November 2023. 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.

### How serious is CVE-2023-24023?

It scores 6.8 out of 10 on the CVSS severity scale, which is medium. Our risk score for CVE-2023-24023 is 25 out of 100, which is Low. Its action is "Monitor". No sign of exploitation and a low forecast. Patch it in your normal update cycle.

### Is CVE-2023-24023 being exploited?

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 1.3%. That can change at any time, which is why we keep watching.

### Which versions does CVE-2023-24023 affect?

For Bluetooth Core Specification: 4.2 to 5.4. The record lists 10 products in all, each with its versions, under "Who is affected" on this page.

### How do I fix CVE-2023-24023?

Install the update the vendor names in its advisory, linked first under "How do I fix" on this page. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet.

## Does CVE-2023-24023 affect you?

Precursor Intelligence keeps checking for you:

- **Tell us what you run.** Pick your software from a list, or let us work it out from your website.
- **We match it to every flaw.** Over 400,000 published flaws, checked against your list.
- **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it.
- **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools.

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