CVE-2020-9851

Protected-filesystem modification via PackageKit access-control failure

Published Jun 9, 2020 · Updated Aug 4, 2024

Access-control failure in PackageKit in Apple macOS before 10.15.5 allows local users to modify protected parts of the file system. PackageKit applies insufficient access restrictions when a malicious application requests protected filesystem changes; Apple has not disclosed the affected operation or policy check. Exploitation requires local execution of a malicious application and user interaction, and the reported consequence is unauthorized file modification.

CVSS severity5.5
Medium
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Access-control failure in PackageKit in Apple macOS before 10.15.5 allows local users to modify protected parts of the file system. PackageKit applies insufficient access restrictions when a malicious application requests protected filesystem changes; Apple has not disclosed the affected operation or policy check. Exploitation requires local execution of a malicious application and user interaction, and the reported consequence is unauthorized file modification.

The record

CVE
CVE-2020-9851
Published
Jun 9, 2020
Updated
Aug 4, 2024
Vendor
Apple
Product
macOS
Classifications
T1203
Attack vector
local
Privileges
unauthenticated

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 privilegesunauthenticated

What is affected?

Apple · macOSversion=unspecified <macOS Catalina 10.15.5

Published CVSS scores

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

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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