CVE-2019-9579Network attack vector

Permission changes via misrouted named-stream attributes

Published Dec 26, 2022 · Updated Apr 14, 2025

Authorization bypass in the SMB server in Nexenta NexentaStor 4.0.5 and 5.1.2 allows remote authenticated users to alter permissions. Requests targeting a ZFS-backed NT named stream forward certain extended-attribute operations to the underlying file instead of the stream. An authenticated SMB account with WRITE_XATTR access can therefore change permissions on the underlying object and gain unintended file access.

CVSS severity8.1
High
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in the SMB server in Nexenta NexentaStor 4.0.5 and 5.1.2 allows remote authenticated users to alter permissions. Requests targeting a ZFS-backed NT named stream forward certain extended-attribute operations to the underlying file instead of the stream. An authenticated SMB account with WRITE_XATTR access can therefore change permissions on the underlying object and gain unintended file access.

The record

CVE
CVE-2019-9579
Published
Dec 26, 2022
Updated
Apr 14, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-276, T1222.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 26, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
8.1NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-276Incorrect Default Permissions
T1222.001File and Directory Permissions Modification

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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