CVE-2021-1751

Code execution via crafted Samba share mount

Published Apr 2, 2021 · Updated Aug 3, 2024

Logic error in NetFSFramework in Apple macOS before 11.2 allows local users to execute arbitrary code by mounting a crafted Samba share. Apple has not published the state transition or data-handling operation that fails when NetFSFramework processes the crafted share. Exploitation requires a user-level context able to mount the attacker-controlled share and yields code execution with that user's privileges.

CVSS severity7.8
High
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Logic error in NetFSFramework in Apple macOS before 11.2 allows local users to execute arbitrary code by mounting a crafted Samba share. Apple has not published the state transition or data-handling operation that fails when NetFSFramework processes the crafted share. Exploitation requires a user-level context able to mount the attacker-controlled share and yields code execution with that user's privileges.

The record

CVE
CVE-2021-1751
Published
Apr 2, 2021
Updated
Aug 3, 2024
Vendor
Apple
Product
macOS
Classifications
T1203
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 2, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 <11.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Apple · macOSversion=unspecified <11.2

Published CVSS scores

4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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