CVE-2020-3850Network attack vector

Remote code execution via CoreBluetooth memory corruption

Published Apr 1, 2020 · Updated Aug 4, 2024

Memory corruption in CoreBluetooth in Apple macOS before Catalina 10.15.3 allows remote attackers to crash applications or execute code. CoreBluetooth processes untrusted input without sufficient validation, corrupting memory; Apple has not disclosed the specific parser, field, or memory operation. No authentication or user interaction is required, and successful processing can terminate the affected application or run attacker-controlled code.

CVSS severity9.8
Critical
EPSS probability3.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in CoreBluetooth in Apple macOS before Catalina 10.15.3 allows remote attackers to crash applications or execute code. CoreBluetooth processes untrusted input without sufficient validation, corrupting memory; Apple has not disclosed the specific parser, field, or memory operation. No authentication or user interaction is required, and successful processing can terminate the affected application or run attacker-controlled code.

The record

CVE
CVE-2020-3850
Published
Apr 1, 2020
Updated
Aug 4, 2024
Vendor
Apple
Product
macOS
Classifications
CWE-20, CWE-787, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 1, 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 10.15.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · macOSversion=unspecified <macOS Catalina 10.15.3

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

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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