CVE-2023-3347

Advisory lineage Upstream: 0 Downstream: 9
Modified
Published: 20 Jul 2023, 14:54
Last modified:20 Nov 2025, 17:26

Vulnerability Summary

Overall Risk (default)
low
24/100
CVSS Score
5.9 MEDIUM
v3.1 (cve.org)
EPSS Score
0.45% LOW
0% probability +0.03%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

20 Jul 2023, 14:54
Published
Vulnerability first disclosed
20 Nov 2025, 17:26
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Trends

Current EPSS score: 0.45%• Percentile: 64%

Techniques & Countermeasures

  • CWE-347•Improper Verification of Cryptographic Signature

    The product does not verify, or incorrectly verifies, the cryptographic signature for data.

  • CWE-924•Improper Enforcement of Message Integrity During Transmission in a Communication Channel

    The product establishes a communication channel with an endpoint and receives a message from that endpoint, but it does not sufficiently ensure that the message was not modified during transmission.

Affected Systems

  • fedoraproject•fedora

    38

  • redhat•enterprise_linux

    8.0 | 9.0

  • redhat•storage

    3.0

  • samba•samba

    ≥ 4.17.0, < 4.17.10 | ≥ 4.18.0, < 4.18.5

References (9)