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    CVE-2023-3347

    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.

    Published:Jul 19, 2023
    Last Modified:Nov 20, 2025
    EPS:Jul 20, 2023
    EPSS Score:0.00896
    CVSS Score:5.9

    Affected Products

    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Storage
    Vendor
    Samba
    Product
    Samba

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-463 Padding Oracle Crypto Attack
    CAPEC-475 Signature Spoofing by Improper Validation

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    References

    https://access.redhat.com/errata/RHSA-2023:4325
    https://access.redhat.com/errata/RHSA-2023:4328
    https://access.redhat.com/security/cve/CVE-2023-3347
    https://bugzilla.redhat.com/show_bug.cgi?id=2222792
    https://www.samba.org/samba/security/CVE-2023-3347.html
    https://access.redhat.com/errata/RHSA-2023:4325
    https://access.redhat.com/errata/RHSA-2023:4328
    https://access.redhat.com/security/cve/CVE-2023-3347
    https://bugzilla.redhat.com/show_bug.cgi?id=2222792
    https://lists.fedoraproject.org/archives/list/[email protected]/message/BPCSGND7LO467AJGR5DYBGZLTCGTOBCC/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/OT74M42E6C36W7PQVY3OS4ZM7DVYB64Z/
    https://security.netapp.com/advisory/ntap-20230731-0010/
    https://www.debian.org/security/2023/dsa-5477
    https://www.samba.org/samba/security/CVE-2023-3347.html

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High