samba: Client side SMB2/3 required signing can be downgraded
Published Jul 7, 2016
7.5
HIGHCVSS 3.1
EPSS 3.10%
Description
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.
Affected products
No data.
No data.
Red Hat Enterprise Linux 6
samba4-0:4.2.10-7.el6_8
Fixed · RHSA-2016:1487
Red Hat Enterprise Linux 7
samba-0:4.2.10-7.el7_2
Fixed · RHSA-2016:1486
Red Hat Gluster Storage 3.1 for RHEL 6
samba-0:4.4.3-8.el6rhs
Fixed · RHSA-2016:1494
Red Hat Gluster Storage 3.1 for RHEL 7
samba-0:4.4.3-8.el7rhgs
Fixed · RHSA-2016:1494
Red Hat Enterprise Linux 5
samba
Not affected
Red Hat Enterprise Linux 6
samba
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | samba4-0:4.2.10-7.el6_8 | Fixed | RHSA-2016:1487 |
| Red Hat Enterprise Linux 7 | samba-0:4.2.10-7.el7_2 | Fixed | RHSA-2016:1486 |
| Red Hat Gluster Storage 3.1 for RHEL 6 | samba-0:4.4.3-8.el6rhs | Fixed | RHSA-2016:1494 |
| Red Hat Gluster Storage 3.1 for RHEL 7 | samba-0:4.4.3-8.el7rhgs | Fixed | RHSA-2016:1494 |
| Red Hat Enterprise Linux 5 | samba | Not affected | n/a |
| Red Hat Enterprise Linux 6 | samba | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:M/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (13 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.10% (0.03097) | 87.29th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.11% (0.03108) | 86.04th | v5 (v2026.06.15) |
| Mar 30, 2025 | 0.87% (0.00867) | 73.06th | v4 (v2025.03.14) |
| Mar 29, 2025 | 1.95% (0.01952) | 72.55th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.87% (0.00867) | 73.55th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.50% (0.00502) | 77.19th | v3 (v2023.03.01) |
| Feb 23, 2024 | 0.50% (0.00502) | 75.80th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.46% (0.00463) | 74.67th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.46% (0.00463) | 71.53th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.54% (0.01537) | 74.52th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.54% (0.01537) | 74.48th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.54% (0.01537) | 72.41th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.54% (0.01537) | 51.33th | v2 (v2022.01.01) |
References (13)
- http://lists.opensuse.org/opensuse-updates/2016-07/msg00060.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2016-1486.html vendor-advisoryx_refsource_REDHATThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2016-1487.html vendor-advisoryx_refsource_REDHATThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2016-1494.html vendor-advisoryx_refsource_REDHATThird Party Advisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html x_refsource_CONFIRMThird Party Advisory
- http://www.securityfocus.com/bid/91700 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1036244 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2016-2119 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1351955 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2016-2119
- https://security.gentoo.org/glsa/201805-07 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2016-2119
- https://www.samba.org/samba/security/CVE-2016-2119.html x_refsource_CONFIRMVendor Advisory
Change history (0)
No recorded changes yet.