CVE-2020-3854

Sandbox escape via undisclosed Security logic flaw

Published Feb 27, 2020 · Updated Aug 4, 2024

Sandbox escape in the Security component of Apple macOS Catalina 10.15.2 allows local users to escape application sandbox restrictions. Apple identifies a logic issue in the Security component but has not disclosed the affected code path or the restriction it fails to enforce. Exploitation requires a user to run a malicious application, after which its process can operate outside the application sandbox.

CVSS severity7.8
High
EPSS probability1.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sandbox escape in the Security component of Apple macOS Catalina 10.15.2 allows local users to escape application sandbox restrictions. Apple identifies a logic issue in the Security component but has not disclosed the affected code path or the restriction it fails to enforce. Exploitation requires a user to run a malicious application, after which its process can operate outside the application sandbox.

The record

CVE
CVE-2020-3854
Published
Feb 27, 2020
Updated
Aug 4, 2024
Vendor
Apple
Product
macOS
Classifications
CWE-787, T1068
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Feb 27, 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 vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Apple · macOSversion=unspecified <macOS Catalina 10.15.3

Published CVSS scores

9.3NIST NVDAV:N/AC:M/Au:N/C:C/I:C/A:C
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1068Exploitation for Privilege Escalation

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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