CVE-2023-3347
Samba: smb2 packet signing is not enforced when "server signing = required" is set
CVSS Score
5.9
EPSS Score
0.0%
EPSS Percentile
0th
A vulnerability was found in Samba's SMB2 packet signing mechanism. The SMB2 packet signing is not enforced if an admin configured "server signing = required" or for SMB2 connections to Domain Controllers where SMB2 packet signing is mandatory. This flaw allows an attacker to perform attacks, such as a man-in-the-middle attack, by intercepting the network traffic and modifying the SMB2 messages between client and server, affecting the integrity of the data.
| CWE | CWE-347 |
| Vendor | red hat |
| Product | red hat enterprise linux 8 |
| Published | Jul 20, 2023 |
| Last Updated | Nov 20, 2025 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None
Affected Versions
Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected Red Hat / Red Hat Storage 3
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2023:4325 access.redhat.com: https://access.redhat.com/errata/RHSA-2023:4328 access.redhat.com: https://access.redhat.com/security/cve/CVE-2023-3347 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2222792 samba.org: https://www.samba.org/samba/security/CVE-2023-3347.html lists.fedoraproject.org: https://lists.fedoraproject.org/archives/list/[email protected]/message/BPCSGND7LO467AJGR5DYBGZLTCGTOBCC/ lists.fedoraproject.org: https://lists.fedoraproject.org/archives/list/[email protected]/message/OT74M42E6C36W7PQVY3OS4ZM7DVYB64Z/ security.netapp.com: https://security.netapp.com/advisory/ntap-20230731-0010/ debian.org: https://www.debian.org/security/2023/dsa-5477