Use-after-free vulnerability in Samba 4.x before 4.7.3 allows remote attackers to execute arbitrary code via a crafted SMB1 request.

published 2017-11-27 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-6241

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 9.9%; EPSS 9.9% chance of exploitation in 30 days, percentile 95%
public exploits: 0; none known

Patch / fix

fixed in 1 distros 7

samba samba 4.5.0, 4.5.15, 4.6.11, 4.7.3

debian ubuntu red hat suse opensuse alpine arch linux

samba Debian 14, Debian 13, Debian 12 2:4.7.1+dfsg-2

debian advisories DEBIAN-CVE-2017-14746

samba Ubuntu 14.04 LTS 2:4.3.11+dfsg-0ubuntu0.14.04.13
samba Ubuntu 16.04 LTS 2:4.3.11+dfsg-0ubuntu0.16.04.12

ubuntu advisories UBUNTU-CVE-2017-14746

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

samba4 RHEL 6 4.2.10-12.el6_9
samba4-dc RHEL 6 4.2.10-12.el6_9
samba4-libs RHEL 6 4.2.10-12.el6_9
samba4-pidl RHEL 6 4.2.10-12.el6_9
samba4-test RHEL 6 4.2.10-12.el6_9
samba4-client RHEL 6 4.2.10-12.el6_9
samba4-common RHEL 6 4.2.10-12.el6_9
samba4-python RHEL 6 4.2.10-12.el6_9

red hat advisories RHSA-2017:3278 RHSA-2017:3260 RHSA-2017:3261

samba SLES 12-LTSS, SLE High Availability Extension 12 4.2.4-18.49.1
samba SLES for SAP 12 SP3, SLES 12 SP3, SLED 12 SP3 +3 more 4.6.9+git.59.c2cff9cea4c-3.17.1
samba SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +3 more 4.4.2-38.14.1
samba SLES for SAP 12 SP2, SLES for SAP 12 SP1, SLES for Raspberry Pi 12 SP2 +6 more 4.2.4-28.24.1

suse advisories SUSE-SU-2018:2321-1 SUSE-SU-2017:3155-1 SUSE-SU-2017:3104-1 SUSE-SU-2017:3086-1

samba openSUSE Tumbleweed 4.14.6+git.182.2205d5224e3-1.1

opensuse advisories openSUSE-SU-2024:11365-1

samba Alpine 3.24, Alpine 3.23, Alpine 3.22 +15 more 4.7.3-r0
samba Alpine 3.4 4.4.16-r1

alpine advisories ALPINE-CVE-2017-14746

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

samba Arch Linux 4.7.3-1

arch linux advisories AVG-535

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-14746 updated 2026-11-04 cvss 6.3

samba: Use-after-free in processing SMB1 requests

Red Hat Enterprise Linux Client (v. 7) samba 4.6.2-12.el7_4, samba-libs 4.6.2-12.el7_4, libwbclient 4.6.2-12.el7_4, libsmbclient 4.6.2-12.el7_4, samba-client 4.6.2-12.el7_4, samba-common 4.6.2-12.el7_4, +7 more Red Hat Enterprise Linux Client Optional (v. 7) samba 4.6.2-12.el7_4, samba-dc 4.6.2-12.el7_4, samba-pidl 4.6.2-12.el7_4, samba-test 4.6.2-12.el7_4, samba-python 4.6.2-12.el7_4, samba-dc-libs 4.6.2-12.el7_4, +3 more Red Hat Enterprise Linux ComputeNode (v. 7) samba 4.6.2-12.el7_4, samba-libs 4.6.2-12.el7_4, libwbclient 4.6.2-12.el7_4, libsmbclient 4.6.2-12.el7_4, samba-client 4.6.2-12.el7_4, samba-common 4.6.2-12.el7_4, +6 more Red Hat Enterprise Linux ComputeNode Optional (v. 7) samba 4.6.2-12.el7_4, samba-dc 4.6.2-12.el7_4, samba-pidl 4.6.2-12.el7_4, samba-test 4.6.2-12.el7_4, samba-python 4.6.2-12.el7_4, samba-dc-libs 4.6.2-12.el7_4, +4 more
fixed: vendor fix RHSA-2017:3260
Red Hat Enterprise Linux Desktop (v. 6) samba4 4.2.10-12.el6_9, samba4-dc 4.2.10-12.el6_9, samba4-libs 4.2.10-12.el6_9, samba4-pidl 4.2.10-12.el6_9, samba4-test 4.2.10-12.el6_9, samba4-client 4.2.10-12.el6_9, +6 more
fixed: vendor fix RHSA-2017:3278
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) samba 4.6.2-12.el7_4, samba-libs 4.6.2-12.el7_4, libwbclient 4.6.2-12.el7_4, libsmbclient 4.6.2-12.el7_4, samba-client 4.6.2-12.el7_4, samba-common 4.6.2-12.el7_4, +8 more Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) samba-dc 4.6.2-12.el7_4, samba-pidl 4.6.2-12.el7_4, samba-test 4.6.2-12.el7_4, samba-python 4.6.2-12.el7_4, samba-dc-libs 4.6.2-12.el7_4, samba-test-libs 4.6.2-12.el7_4, +1 more
fixed: vendor fix RHSA-2017:3260
Red Hat Enterprise Linux HPC Node (v. 6) samba4 4.2.10-12.el6_9, samba4-dc 4.2.10-12.el6_9, samba4-libs 4.2.10-12.el6_9, samba4-pidl 4.2.10-12.el6_9, samba4-test 4.2.10-12.el6_9, samba4-client 4.2.10-12.el6_9, +6 more Red Hat Enterprise Linux Server (v. 6) samba4 4.2.10-12.el6_9, samba4-dc 4.2.10-12.el6_9, samba4-libs 4.2.10-12.el6_9, samba4-pidl 4.2.10-12.el6_9, samba4-test 4.2.10-12.el6_9, samba4-client 4.2.10-12.el6_9, +6 more
fixed: vendor fix RHSA-2017:3278
Red Hat Enterprise Linux Server (v. 7) samba 4.6.2-12.el7_4, samba-libs 4.6.2-12.el7_4, libwbclient 4.6.2-12.el7_4, libsmbclient 4.6.2-12.el7_4, samba-client 4.6.2-12.el7_4, samba-common 4.6.2-12.el7_4, +8 more Red Hat Enterprise Linux Server Optional (v. 7) samba-dc 4.6.2-12.el7_4, samba-pidl 4.6.2-12.el7_4, samba-test 4.6.2-12.el7_4, samba-python 4.6.2-12.el7_4, samba-dc-libs 4.6.2-12.el7_4, samba-test-libs 4.6.2-12.el7_4, +2 more Red Hat Enterprise Linux Server Resilient Storage (v. 7) ctdb 4.6.2-12.el7_4, ctdb-tests 4.6.2-12.el7_4
fixed: vendor fix RHSA-2017:3260
Red Hat Enterprise Linux Workstation (v. 6) samba4 4.2.10-12.el6_9, samba4-dc 4.2.10-12.el6_9, samba4-libs 4.2.10-12.el6_9, samba4-pidl 4.2.10-12.el6_9, samba4-test 4.2.10-12.el6_9, samba4-client 4.2.10-12.el6_9, +6 more
fixed: vendor fix RHSA-2017:3278
Red Hat Enterprise Linux Workstation (v. 7) samba 4.6.2-12.el7_4, samba-libs 4.6.2-12.el7_4, libwbclient 4.6.2-12.el7_4, libsmbclient 4.6.2-12.el7_4, samba-client 4.6.2-12.el7_4, samba-common 4.6.2-12.el7_4, +8 more Red Hat Enterprise Linux Workstation Optional (v. 7) samba-dc 4.6.2-12.el7_4, samba-pidl 4.6.2-12.el7_4, samba-test 4.6.2-12.el7_4, samba-dc-libs 4.6.2-12.el7_4, samba-test-libs 4.6.2-12.el7_4, samba-vfs-glusterfs 4.6.2-12.el7_4, +1 more
fixed: vendor fix RHSA-2017:3260
Red Hat Gluster 3.3 Samba on RHEL-6 ctdb 4.6.3-9.el6rhs, samba 4.6.3-9.el6rhs, samba-dc 4.6.3-9.el6rhs, ctdb-tests 4.6.3-9.el6rhs, samba-libs 4.6.3-9.el6rhs, samba-pidl 4.6.3-9.el6rhs, +17 more Red Hat Gluster 3.3 Samba on RHEL-7 ctdb 4.6.3-9.el7rhgs, samba 4.6.3-9.el7rhgs, samba-dc 4.6.3-9.el7rhgs, ctdb-tests 4.6.3-9.el7rhgs, samba-libs 4.6.3-9.el7rhgs, samba-pidl 4.6.3-9.el7rhgs, +17 more
fixed: vendor fix RHSA-2017:3261

show 1 more

Red Hat Enterprise Linux 5 samba Red Hat Enterprise Linux 6 samba, samba-swat, libsmbclient, samba-client, samba-common, samba-winbind, +4 more
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

9.88% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

CWE-416 Use After Free

References

access.redhat.com /errata/RHSA-2017:3278
vendor-advisory, third-party-advisory
debian.org /security/2017/dsa-4043
vendor-advisory, third-party-advisory
access.redhat.com /errata/RHSA-2017:3260
vendor-advisory, third-party-advisory
access.redhat.com /errata/RHSA-2017:3261
vendor-advisory, third-party-advisory
security.gentoo.org /glsa/201805-07
vendor-advisory, third-party-advisory
ubuntu.com /usn/USN-3486-1
vendor-advisory, third-party-advisory
samba.org /samba/security/CVE-2017-14746.html
issue-tracking, vendor-advisory
securitytracker.com /id/1039856
vdb-entry, third-party-advisory
securityfocus.com /bid/101907
vdb-entry, third-party-advisory
support.hpe.com /hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03817en_us
third-party-advisory
synology.com /support/security/Synology_SA_17_72_Samba
third-party-advisory

Sources

CVE List CVE-2017-14746
NVD CVE-2017-14746

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary