CVE-2023-3347

MEDIUM

5.9

CVSS v3

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.

CWE-347 CWE-924

How to fix

Remediation Available

sambaDebian

Fixed in:2:4.17.10+dfsg-0+deb12u1CVE-2023-3347

Fixed in:2:4.18.5+dfsg-1CVE-2023-3347

ctdbRed Hat / RHEL

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

ctdbRocky

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

ctdb-debuginfoRed Hat / RHEL

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

ctdb-debuginfoRocky

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

libnetapiRocky

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

libnetapiRed Hat / RHEL

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

libnetapi-debuginfoRed Hat / RHEL

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

libnetapi-debuginfoRocky

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

libnetapi-develRocky

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

libnetapi-develRed Hat / RHEL

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

libsmbclientRocky

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

libsmbclientRed Hat / RHEL

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

libsmbclient-debuginfoRocky

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

libsmbclient-debuginfoRed Hat / RHEL

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

libsmbclient-develRocky

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

libsmbclient-develRed Hat / RHEL

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

libwbclientRocky

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

libwbclientRed Hat / RHEL

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

libwbclient-debuginfoRed Hat / RHEL

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

libwbclient-debuginfoRocky

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

libwbclient-develRed Hat / RHEL

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

libwbclient-develRocky

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

python3-sambaRed Hat / RHEL

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

python3-sambaRocky

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

python3-samba-dcRed Hat / RHEL

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

python3-samba-dcRocky

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

python3-samba-dc-debuginfoRed Hat / RHEL

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

python3-samba-dc-debuginfoRocky

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

python3-samba-debuginfoRed Hat / RHEL

Fixed in:0:4.17.5-3.el8_8RHSA-2023:4328

Fixed in:0:4.17.5-103.el9_2RHSA-2023:4325

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploit Intelligence

0.44%probability of exploitation in 30 days

36thpercentile

Low risk: more likely to be exploited than 36% of all known CVEs.

References

Vendor Advisory1

samba.org

Third-Party Advisory4

Other references4

Related Vulnerabilities

Other CWE-347 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2018-16042	Medium	6.5	82%	-	-
CVE-2025-59718	Critical	9.8	69%	KEV	Fix
CVE-2025-25292	Critical	9.8	65%	-	Fix
CVE-2021-22160	Critical	9.8	53%	-	Fix
CVE-2013-3900	Medium	5.5	45%	KEV	-
CVE-2018-0114	High	7.5	43%	-	Fix

Common questions

How do I fix CVE-2023-3347?

Published advisories record a fix for 120 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2023-3347 being actively exploited?

Not that we know of. CVE-2023-3347 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.44% is the estimated probability that it will be exploited in the next 30 days. That is higher than 36% of all scored CVEs.

How severe is CVE-2023-3347?

CVE-2023-3347 has a CVSS v3 base score of 5.9, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2023-3347 affect?

Published advisories record a fix for samba (Debian), ctdb (Red Hat / RHEL), ctdb (Rocky), ctdb-debuginfo (Red Hat / RHEL), and 116 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2023-3347

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-12-06.