CVE-2023-4091

mediumpriority · track · 26OT risk · elevatedEPSS 0.013 · 71 %ileDEEUNLRUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.33% (71st) EPSS

CVSS 6.5 · medium

Is it mine?

54 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

A vulnerability was discovered in Samba, where the flaw allows SMB clients to truncate files, even with read-only permissions when the Samba VFS module "acl_xattr" is configured with "acl_xattr:ignore system acls = yes". The SMB protocol allows opening files when the client requests read-only access but then implicitly truncates the opened file to 0 bytes if the client specifies a separate OVERWRITE create disposition request. The issue arises in configurations that bypass kernel file system permissions checks, relying solely on Samba's permissions.

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 6–9.8

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 3.6

v3.16.5mediumAV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:Nsecondary · FSTEC (BDU) RU

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:Nsecondary · ENISA EU

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:Nsecondary · secalert@redhat.com USexploitability 2.8 · impact 3.6

v3.16mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · NCSC-NL NL

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-276USprimaryCWE-264USCWE-275USCWE-276USCWE-284US

affected products (54)

Products and version ranges known to be affected.

Amazon Linux 2all versionscert_bundDEcpe:/o:amazon:linux_2:-
Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Fedora Linuxall versionscert_bundDEcpe:/o:fedoraproject:fedora:-
Gentoo Linuxall versionscert_bundDEcpe:/o:gentoo:linux:-
HPE HP-UX (CIFS) Client/Server <B.04.18.01.00all versionscert_bundDE
IBM QRadar SIEM 7.5all versionscert_bundDEcpe:/a:ibm:qradar_siem:7.5
IBM QRadar SIEM <7.5.0 UP8all versionscert_bundDE
IBM Spectrum Protect Plus <10.1.17all versionscert_bundDE
Open Source Samba <4.17.12all versionscert_bundDE
Open Source Samba <4.18.8all versionscert_bundDE
Open Source Samba <4.19.1all versionscert_bundDE
Oracle Linuxall versionscert_bundDEcpe:/o:oracle:linux:-
QNAP NASall versionscert_bundDEcpe:/h:qnap:nas:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
Ubuntu Linuxall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:-
HPE HP-UX≤ (CIFS) Client/Server <B.04.18.01.00cert_bundDE
IBM QRadar SIEM< 7.5.0 UP8cert_bundDE
IBM Spectrum Protect Plus< 10.1.17cert_bundDE
Open Source Samba< 4.17.12cert_bundDE

showing 20 of 54

advisories (2)

Vendor and ecosystem advisories describing this.

NCSC-2025-0026Kwetsbaarheden verholpen in Oracle JD EdwardsNL2025-01-22csaf · ncsc_nlNL
Oracle heeft kwetsbaarheden verholpen in JD Edwards EnterpriseOne Tools (specifiek voor versies prior tot 9.2.9.2).
WID-SEC-W-2023-2620Samba: Mehrere SchwachstellenDeutsch2023-10-10csaf · cert_bundDE
Ein entfernter anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in Samba ausnutzen, um einen Denial-of-Service-Zustand zu erzeugen, Dateien zu manipulieren oder vertrauliche Informationen offenzulegen.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund ncsc_nl NVD CVE.org MITRE

published 2023-11-03modified 2026-06-17

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+2180 more

references (32)

External citations — patches, advisories, analysis.

scry

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