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Fencer Intel
medium 5.9

CVE-2016-2124 json

A flaw was found in the way samba implemented SMB1 authentication.

published 2022-02-18 4 y ago modified 2026-06-17 4 mo ago also EUVD-2016-3227

cvss
5.9
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits
0
none known

Summary

A flaw was found in the way samba implemented SMB1 authentication. An attacker could use this flaw to retrieve the plaintext password sent over the wire even if Kerberos authentication was required.

Patch / fix

  • samba samba 4.13.14, 4.14.10, 4.15.2
  • samba Debian 14, Debian 13, Debian 12 2:4.13.14+dfsg-1

debian advisories DEBIAN-CVE-2016-2124

  • samba Ubuntu 18.04 LTS 2:4.7.6+dfsg~ubuntu-0ubuntu2.26
  • samba Ubuntu 20.04 LTS 2:4.13.14+dfsg-0ubuntu0.20.04.1
  • samba Ubuntu 22.04 LTS 2:4.13.14+dfsg-0ubuntu1

ubuntu advisories UBUNTU-CVE-2016-2124

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

  • samba RHEL 7 4.10.16-17.el7_9
  • ctdb RHEL 7 4.10.16-17.el7_9
  • samba-dc RHEL 7 4.10.16-17.el7_9
  • ctdb-tests RHEL 7 4.10.16-17.el7_9
  • samba-libs RHEL 7 4.10.16-17.el7_9
  • samba-pidl RHEL 7 4.10.16-17.el7_9
  • samba-test RHEL 7 4.10.16-17.el7_9
  • libwbclient RHEL 7 4.10.16-17.el7_9

red hat advisories RHSA-2022:0074RHSA-2022:0008RHSA-2021:5192RHSA-2021:5082RHSA-2021:4844RHSA-2021:4843

  • samba Enterprise Storage 7 4.13.13+git.545.5897c2d94f3-3.12.1
  • ldb Enterprise Storage 7 2.2.2-4.6.1
  • samba SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +2 more 4.7.11+git.352.41e30c5a0f7-4.57.1
  • samba SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES 12 SP4-LTSS +9 more 4.6.16+git.307.b3899d08cc6-3.64.2
  • samba SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +4 more 4.9.5+git.471.5edbe3dcae7-3.57.2
  • samba SLES 12 SP2-BCL 4.4.2-38.45.2
  • samba SLE Module for Python 2 15 SP2, SLE Module for Basesystem 15 SP2, SLE High Availability Extension 15 SP2 4.11.14+git.308.666c63d4eea-4.28.1
  • samba SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 +1 more 4.10.18+git.339.c912385a5e1-3.41.1

suse advisories SUSE-SU-2022:0361-1SUSE-SU-2021:3747-1SUSE-SU-2021:3746-1SUSE-SU-2021:3674-1SUSE-SU-2021:3673-1SUSE-SU-2021:3650-1

  • samba openSUSE Tumbleweed 4.15.2+git.193.a4d6307f1fd-1.1
  • samba openSUSE Leap 15.3 4.9.5+git.471.5edbe3dcae7-3.57.2
  • samba openSUSE Leap 15.2 4.11.14+git.308.666c63d4eea-lp152.3.28.1
  • samba openSUSE Leap 15.3 4.11.14+git.308.666c63d4eea-4.28.1
  • ldb openSUSE Leap 15.3 2.2.2-3.3.1
  • samba openSUSE Leap 15.3 4.13.13+git.528.140935f8d6a-3.12.1

opensuse advisories openSUSE-SU-2024:11631-1openSUSE-SU-2021:3674-1openSUSE-SU-2021:1471-1openSUSE-SU-2021:3650-1openSUSE-SU-2021:3647-1

  • samba-vfs-iouring AlmaLinux 8 4.14.5-7.el8_5

almalinux advisories ALSA-2021:5082

  • samba Rocky Linux 8 4.14.5-7.el8_5

rocky linux advisories RLSA-2021:5082

  • samba Alpine 3.13 4.13.17-r0
  • samba Alpine 3.14 4.14.12-r0
  • samba Alpine 3.24, Alpine 3.23, Alpine 3.22 +7 more 4.15.2-r0

alpine advisories ALPINE-CVE-2016-2124

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 Azure Linux 3.0 4.18.3-1

azure linux advisories AZL-36986

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • smbclient Arch Linux 4.15.2-1

arch linux advisories AVG-2539

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-2016-2124 updated cvss 6.8

samba: SMB1 client connections can be downgraded to plaintext authentication

  • Red Hat Enterprise Linux 6 samba, samba4, samba4-dc, samba-swat, samba4-libs, samba4-pidl, +17 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat CodeReady Linux Builder (v. 8) samba-devel 4.14.5-7.el8_5, ctdb-debuginfo 4.14.5-7.el8_5, samba-debuginfo 4.14.5-7.el8_5, libwbclient-devel 4.14.5-7.el8_5, samba-debugsource 4.14.5-7.el8_5, libsmbclient-devel 4.14.5-7.el8_5, +17 more
    fixed: vendor fix RHSA-2021:5082
  • Red Hat CodeReady Linux Builder EUS (v. 8.2) ctdb-debuginfo 4.11.2-18.el8_2, samba-debuginfo 4.11.2-18.el8_2, libwbclient-devel 4.11.2-18.el8_2, samba-debugsource 4.11.2-18.el8_2, libsmbclient-devel 4.11.2-18.el8_2, ctdb-tests-debuginfo 4.11.2-18.el8_2, +16 more
    fixed: vendor fix RHSA-2022:0074
  • Red Hat Enterprise Linux AppStream (v. 8) samba-vfs-iouring 4.14.5-7.el8_5 Red Hat Enterprise Linux BaseOS (v. 8) ctdb 4.14.5-7.el8_5, samba 4.14.5-7.el8_5, samba-libs 4.14.5-7.el8_5, samba-pidl 4.14.5-7.el8_5, samba-test 4.14.5-7.el8_5, libwbclient 4.14.5-7.el8_5, +15 more
    fixed: vendor fix RHSA-2021:5082
  • Red Hat Enterprise Linux BaseOS EUS (v. 8.2) ctdb 4.11.2-18.el8_2, samba 4.11.2-18.el8_2, ctdb-tests 4.11.2-18.el8_2, samba-libs 4.11.2-18.el8_2, samba-pidl 4.11.2-18.el8_2, samba-test 4.11.2-18.el8_2, +15 more
    fixed: vendor fix RHSA-2022:0074
  • Red Hat Enterprise Linux BaseOS EUS (v.8.4) ctdb 4.13.3-8.el8_4, samba 4.13.3-8.el8_4, ctdb-tests 4.13.3-8.el8_4, samba-libs 4.13.3-8.el8_4, samba-pidl 4.13.3-8.el8_4, samba-test 4.13.3-8.el8_4, +16 more
    fixed: vendor fix RHSA-2022:0008
  • Red Hat Enterprise Linux Client (v. 7) samba 4.10.16-17.el7_9, samba-libs 4.10.16-17.el7_9, libwbclient 4.10.16-17.el7_9, libsmbclient 4.10.16-17.el7_9, samba-client 4.10.16-17.el7_9, samba-common 4.10.16-17.el7_9, +7 more Red Hat Enterprise Linux Client Optional (v. 7) samba 4.10.16-17.el7_9, samba-dc 4.10.16-17.el7_9, samba-pidl 4.10.16-17.el7_9, samba-test 4.10.16-17.el7_9, samba-python 4.10.16-17.el7_9, samba-dc-libs 4.10.16-17.el7_9, +4 more Red Hat Enterprise Linux ComputeNode Optional (v. 7) samba 4.10.16-17.el7_9, samba-dc 4.10.16-17.el7_9, samba-pidl 4.10.16-17.el7_9, samba-test 4.10.16-17.el7_9, samba-python 4.10.16-17.el7_9, samba-dc-libs 4.10.16-17.el7_9, +5 more
    fixed: vendor fix RHSA-2021:5192
  • Red Hat Enterprise Linux CRB EUS (v.8.4) samba-devel 4.13.3-8.el8_4, ctdb-debuginfo 4.13.3-8.el8_4, samba-debuginfo 4.13.3-8.el8_4, libwbclient-devel 4.13.3-8.el8_4, samba-debugsource 4.13.3-8.el8_4, libsmbclient-devel 4.13.3-8.el8_4, +18 more
    fixed: vendor fix RHSA-2022:0008
show 4 more
  • Red Hat Enterprise Linux Server (v. 7) samba 4.10.16-17.el7_9, samba-libs 4.10.16-17.el7_9, libwbclient 4.10.16-17.el7_9, libsmbclient 4.10.16-17.el7_9, samba-client 4.10.16-17.el7_9, samba-common 4.10.16-17.el7_9, +8 more Red Hat Enterprise Linux Server Optional (v. 7) samba-dc 4.10.16-17.el7_9, samba-pidl 4.10.16-17.el7_9, samba-test 4.10.16-17.el7_9, samba-python 4.10.16-17.el7_9, samba-dc-libs 4.10.16-17.el7_9, samba-test-libs 4.10.16-17.el7_9, +3 more Red Hat Enterprise Linux Server Resilient Storage (v. 7) ctdb 4.10.16-17.el7_9, ctdb-tests 4.10.16-17.el7_9 Red Hat Enterprise Linux Workstation (v. 7) samba 4.10.16-17.el7_9, samba-libs 4.10.16-17.el7_9, libwbclient 4.10.16-17.el7_9, libsmbclient 4.10.16-17.el7_9, samba-client 4.10.16-17.el7_9, samba-common 4.10.16-17.el7_9, +8 more Red Hat Enterprise Linux Workstation Optional (v. 7) samba-dc 4.10.16-17.el7_9, samba-pidl 4.10.16-17.el7_9, samba-test 4.10.16-17.el7_9, samba-dc-libs 4.10.16-17.el7_9, samba-test-libs 4.10.16-17.el7_9, samba-python-test 4.10.16-17.el7_9, +2 more
    fixed: vendor fix RHSA-2021:5192
  • Red Hat Gluster 3.5 Samba on RHEL-7 ctdb 4.11.6-114.el7rhgs, samba 4.11.6-114.el7rhgs, samba-libs 4.11.6-114.el7rhgs, samba-pidl 4.11.6-114.el7rhgs, libwbclient 4.11.6-114.el7rhgs, libsmbclient 4.11.6-114.el7rhgs, +12 more
    fixed: vendor fix RHSA-2021:4844
  • Red Hat Gluster 3.5 Samba on RHEL-8 ctdb 4.14.5-204.el8rhgs, samba 4.14.5-204.el8rhgs, samba-libs 4.14.5-204.el8rhgs, samba-pidl 4.14.5-204.el8rhgs, libwbclient 4.14.5-204.el8rhgs, libsmbclient 4.14.5-204.el8rhgs, +12 more
    fixed: vendor fix RHSA-2021:4843
  • Red Hat Enterprise Linux 9 ctdb, samba, libldb, ldb-tools, libnetapi, samba-libs, +27 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

1.77% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N

Affected products

  • n/a samba

Classification

Weakness

References

Sources

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.