CVE-2020-9831

Kernel-layout disclosure via Bluetooth out-of-bounds read

Published Jun 9, 2020 · Updated Aug 4, 2024

An out-of-bounds read in the Bluetooth component of Apple macOS before 10.15.5 allows local users to disclose kernel memory layout. The Bluetooth code reads beyond a buffer boundary because its bounds checking does not reject an out-of-range access; Apple has not named the function or input. Execution of a malicious local application and user interaction are required, and the reported consequence is limited to kernel-address layout disclosure.

CVSS severity5.5
Medium
EPSS probability0.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds read in the Bluetooth component of Apple macOS before 10.15.5 allows local users to disclose kernel memory layout. The Bluetooth code reads beyond a buffer boundary because its bounds checking does not reject an out-of-range access; Apple has not named the function or input. Execution of a malicious local application and user interaction are required, and the reported consequence is limited to kernel-address layout disclosure.

The record

CVE
CVE-2020-9831
Published
Jun 9, 2020
Updated
Aug 4, 2024
Vendor
Apple
Product
macOS
Classifications
CWE-125
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jun 9, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <macOS Catalina 10.15.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Apple · macOSversion=unspecified <macOS Catalina 10.15.5

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:P/I:N/A:N
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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