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Fencer Vulns
high 7.5

CVE-2016-2119 json

libcli/smb/smbXcli_base.c in Samba 4.x before 4.2.14, 4.3.x before 4.3.11, and 4.4.x before 4.4.5 allows man-in-the-middle attackers to byp…

published 2016-07-07 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-3222

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.1%
EPSS 3.1% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

libcli/smb/smbXcli_base.c in Samba 4.x before 4.2.14, 4.3.x before 4.3.11, and 4.4.x before 4.4.5 allows man-in-the-middle attackers to bypass a client-signing protection mechanism, and consequently spoof SMB2 and SMB3 servers, via the (1) SMB2_SESSION_FLAG_IS_GUEST or (2) SMB2_SESSION_FLAG_IS_NULL flag.

Patch / fix

  • samba samba 4.2.14, 4.3.11, 4.4.5
  • samba Debian 14, Debian 13, Debian 12 2:4.4.5+dfsg-1

debian advisories DEBIAN-CVE-2016-2119

  • samba Ubuntu 14.04 LTS 2:4.3.11+dfsg-0ubuntu0.14.04.1
  • samba Ubuntu 16.04 LTS 2:4.3.11+dfsg-0ubuntu0.16.04.1

ubuntu advisories UBUNTU-CVE-2016-2119

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 storage 3.1 4.4.3-8.el6rhs
  • samba storage 3.1 4.4.3-8.el7rhgs
  • ctdb storage 3.1 4.4.3-8.el6rhs
  • ctdb storage 3.1 4.4.3-8.el7rhgs
  • samba-dc storage 3.1 4.4.3-8.el6rhs
  • samba-dc storage 3.1 4.4.3-8.el7rhgs
  • ctdb-tests storage 3.1 4.4.3-8.el6rhs
  • ctdb-tests storage 3.1 4.4.3-8.el7rhgs

red hat advisories RHSA-2016:1494RHSA-2016:1486RHSA-2016:1487

  • samba SLES for SAP 12 SP1, SLES 12 SP1, SLED 12 SP1 +2 more 4.2.4-26.2
  • samba SLES 12-LTSS 4.2.4-18.27.9

suse advisories SUSE-SU-2016:2570-1SUSE-SU-2016:2306-1

  • samba openSUSE Tumbleweed 4.5.0-1.1

opensuse advisories openSUSE-SU-2024:10069-1

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-2016-2119 updated cvss 7.5

samba: Client side SMB2/3 required signing can be downgraded

  • Red Hat Enterprise Linux Client (v. 7) samba 4.2.10-7.el7_2, samba-libs 4.2.10-7.el7_2, libwbclient 4.2.10-7.el7_2, libsmbclient 4.2.10-7.el7_2, samba-client 4.2.10-7.el7_2, samba-common 4.2.10-7.el7_2, +6 more Red Hat Enterprise Linux Client Optional (v. 7) samba 4.2.10-7.el7_2, samba-dc 4.2.10-7.el7_2, samba-pidl 4.2.10-7.el7_2, samba-test 4.2.10-7.el7_2, samba-python 4.2.10-7.el7_2, samba-dc-libs 4.2.10-7.el7_2, +3 more Red Hat Enterprise Linux ComputeNode (v. 7) samba 4.2.10-7.el7_2, samba-libs 4.2.10-7.el7_2, libwbclient 4.2.10-7.el7_2, libsmbclient 4.2.10-7.el7_2, samba-client 4.2.10-7.el7_2, samba-common 4.2.10-7.el7_2, +6 more Red Hat Enterprise Linux ComputeNode Optional (v. 7) samba 4.2.10-7.el7_2, samba-dc 4.2.10-7.el7_2, samba-pidl 4.2.10-7.el7_2, samba-test 4.2.10-7.el7_2, samba-python 4.2.10-7.el7_2, samba-dc-libs 4.2.10-7.el7_2, +3 more
    fixed: vendor fix RHSA-2016:1486
  • Red Hat Enterprise Linux Desktop (v. 6) samba4 4.2.10-7.el6_8, samba4-dc 4.2.10-7.el6_8, samba4-libs 4.2.10-7.el6_8, samba4-pidl 4.2.10-7.el6_8, samba4-test 4.2.10-7.el6_8, samba4-client 4.2.10-7.el6_8, +6 more Red Hat Enterprise Linux HPC Node (v. 6) samba4 4.2.10-7.el6_8, samba4-dc 4.2.10-7.el6_8, samba4-libs 4.2.10-7.el6_8, samba4-pidl 4.2.10-7.el6_8, samba4-test 4.2.10-7.el6_8, samba4-client 4.2.10-7.el6_8, +6 more Red Hat Enterprise Linux Server (v. 6) samba4 4.2.10-7.el6_8, samba4-dc 4.2.10-7.el6_8, samba4-libs 4.2.10-7.el6_8, samba4-pidl 4.2.10-7.el6_8, samba4-test 4.2.10-7.el6_8, samba4-client 4.2.10-7.el6_8, +6 more
    fixed: vendor fix RHSA-2016:1487
  • Red Hat Enterprise Linux Server (v. 7) samba 4.2.10-7.el7_2, samba-libs 4.2.10-7.el7_2, libwbclient 4.2.10-7.el7_2, libsmbclient 4.2.10-7.el7_2, samba-client 4.2.10-7.el7_2, samba-common 4.2.10-7.el7_2, +7 more Red Hat Enterprise Linux Server Optional (v. 7) samba-dc 4.2.10-7.el7_2, samba-pidl 4.2.10-7.el7_2, samba-test 4.2.10-7.el7_2, samba-python 4.2.10-7.el7_2, samba-dc-libs 4.2.10-7.el7_2, samba-test-libs 4.2.10-7.el7_2, +2 more Red Hat Enterprise Linux Server Resilient Storage (v. 7) ctdb 4.2.10-7.el7_2, ctdb-tests 4.2.10-7.el7_2
    fixed: vendor fix RHSA-2016:1486
  • Red Hat Enterprise Linux Workstation (v. 6) samba4 4.2.10-7.el6_8, samba4-dc 4.2.10-7.el6_8, samba4-libs 4.2.10-7.el6_8, samba4-pidl 4.2.10-7.el6_8, samba4-test 4.2.10-7.el6_8, samba4-client 4.2.10-7.el6_8, +6 more
    fixed: vendor fix RHSA-2016:1487
  • Red Hat Enterprise Linux Workstation (v. 7) samba 4.2.10-7.el7_2, samba-libs 4.2.10-7.el7_2, libwbclient 4.2.10-7.el7_2, libsmbclient 4.2.10-7.el7_2, samba-client 4.2.10-7.el7_2, samba-common 4.2.10-7.el7_2, +7 more Red Hat Enterprise Linux Workstation Optional (v. 7) samba-dc 4.2.10-7.el7_2, samba-pidl 4.2.10-7.el7_2, samba-test 4.2.10-7.el7_2, samba-dc-libs 4.2.10-7.el7_2, samba-test-libs 4.2.10-7.el7_2, samba-vfs-glusterfs 4.2.10-7.el7_2, +1 more
    fixed: vendor fix RHSA-2016:1486
  • Red Hat Gluster 3 Samba on RHEL-6 ctdb 4.4.3-8.el6rhs, samba 4.4.3-8.el6rhs, samba-dc 4.4.3-8.el6rhs, ctdb-tests 4.4.3-8.el6rhs, samba-libs 4.4.3-8.el6rhs, samba-pidl 4.4.3-8.el6rhs, +16 more Red Hat Gluster 3 Samba on RHEL-7 ctdb 4.4.3-8.el7rhgs, samba 4.4.3-8.el7rhgs, samba-dc 4.4.3-8.el7rhgs, ctdb-tests 4.4.3-8.el7rhgs, samba-libs 4.4.3-8.el7rhgs, samba-pidl 4.4.3-8.el7rhgs, +16 more
    fixed: vendor fix RHSA-2016:1494
  • 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

3.10% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-94 Improper Control of Generation of Code

References

Sources

Fencer Vulns 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.