CVE-2023-3347: Fedoraproject Fedora

Medium severity, CVSS 5.9. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Fedoraproject Fedora: version 38 only
• Red Hat Enterprise Linux: version 8.0 only; version 9.0 only
• Red Hat Storage: version 3.0 only
• Samba Samba: from 4.17.0, before 4.17.10 (fixed in 4.17.10); from 4.18.0, before 4.18.5 (fixed in 4.18.5)

Published 2023-07-20. Last modified 2026-06-17.