samba: client requesting encryption vulnerable to downgrade attack
Published Dec 29, 2015
5.4
MEDIUMCVSS 3.1
EPSS 7.26%
Description
Samba 3.x and 4.x before 4.1.22, 4.2.x before 4.2.7, and 4.3.x before 4.3.3 supports connections that are encrypted but unsigned, which allows man-in-the-middle attackers to conduct encrypted-to-unencrypted downgrade attacks by modifying the client-server data stream, related to clidfs.c, libsmb_server.c, and smbXcli_base.c.
Affected products
No data.
Configuration 1
Configuration 2
- 7.0
- 8.0
Configuration 3
- 12.04
- 14.04
- 15.04
- 15.10
No data.
Red Hat Enterprise Linux 6
samba-0:3.6.23-24.el6_7
Fixed · RHSA-2016:0011
Red Hat Enterprise Linux 6
samba4-0:4.0.0-67.el6_7.rc4
Fixed · RHSA-2016:0010
Red Hat Enterprise Linux 7
samba-0:4.2.3-11.el7_2
Fixed · RHSA-2016:0006
Red Hat Gluster Storage 3.1 for RHEL 6
samba-0:4.1.17-16.el6rhs
Fixed · RHSA-2016:0015
Red Hat Gluster Storage 3.1 for RHEL 7
samba-0:4.2.4-9.1.el7rhgs
Fixed · RHSA-2016:0016
Red Hat Enterprise Linux 5
samba
Not affected
Red Hat Enterprise Linux 5
samba3x
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | samba-0:3.6.23-24.el6_7 | Fixed | RHSA-2016:0011 |
| Red Hat Enterprise Linux 6 | samba4-0:4.0.0-67.el6_7.rc4 | Fixed | RHSA-2016:0010 |
| Red Hat Enterprise Linux 7 | samba-0:4.2.3-11.el7_2 | Fixed | RHSA-2016:0006 |
| Red Hat Gluster Storage 3.1 for RHEL 6 | samba-0:4.1.17-16.el6rhs | Fixed | RHSA-2016:0015 |
| Red Hat Gluster Storage 3.1 for RHEL 7 | samba-0:4.2.4-9.1.el7rhgs | Fixed | RHSA-2016:0016 |
| Red Hat Enterprise Linux 5 | samba | Not affected | n/a |
| Red Hat Enterprise Linux 5 | samba3x | Will not fix | 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:N/S:C/C:L/I:L/A:N
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:N/I:P/A:N
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 (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 7.26% (0.07263) | 94.16th | v5 (v2026.06.15) |
| Jun 15, 2026 | 7.29% (0.07290) | 93.55th | v5 (v2026.06.15) |
| Nov 30, 2025 | 4.14% (0.04144) | 88.23th | v4 (v2025.03.14) |
| Nov 17, 2025 | 7.15% (0.07151) | 91.18th | v4 (v2025.03.14) |
| Oct 19, 2025 | 4.14% (0.04144) | 88.11th | v4 (v2025.03.14) |
| Aug 31, 2025 | 7.71% (0.07708) | 91.57th | v4 (v2025.03.14) |
| Mar 30, 2025 | 4.14% (0.04144) | 87.58th | v4 (v2025.03.14) |
| Mar 29, 2025 | 6.56% (0.06557) | 84.82th | v4 (v2025.03.14) |
| Mar 17, 2025 | 4.48% (0.04481) | 88.36th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.19% (0.00190) | 57.76th | v3 (v2023.03.01) |
| Nov 15, 2023 | 0.19% (0.00190) | 56.47th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.19% (0.00188) | 54.46th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.69% (0.02686) | 82.85th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.69% (0.02686) | 81.17th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.69% (0.02686) | 62.66th | v2 (v2022.01.01) |
References (28)
- http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174076.html vendor-advisoryx_refsource_FEDORAMailing ListThird Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174391.html vendor-advisoryx_refsource_FEDORAMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00019.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00020.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00032.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00033.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00002.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00017.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00042.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00047.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00048.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://www.debian.org/security/2016/dsa-3433 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html x_refsource_CONFIRMThird Party Advisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html x_refsource_CONFIRMThird Party Advisory
- http://www.securityfocus.com/bid/79732 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1034493 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- http://www.ubuntu.com/usn/USN-2855-1 vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- http://www.ubuntu.com/usn/USN-2855-2 vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2015-5296 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1290292 x_refsource_CONFIRMIssue TrackingThird Party Advisory
- https://git.samba.org/?p=samba.git%3Ba=commit%3Bh=1ba49b8f389eda3414b14410c7fbcb4041ca06b1 x_refsource_CONFIRM
- https://git.samba.org/?p=samba.git%3Ba=commit%3Bh=a819d2b440aafa3138d95ff6e8b824da885a70e9 x_refsource_CONFIRM
- https://git.samba.org/?p=samba.git%3Ba=commit%3Bh=d724f835acb9f4886c0001af32cd325dbbf1f895 x_refsource_CONFIRM
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05115993 x_refsource_CONFIRMThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2015-5296
- https://security.gentoo.org/glsa/201612-47 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2015-5296
- https://www.samba.org/samba/security/CVE-2015-5296.html x_refsource_CONFIRMVendor Advisory
Change history (0)
No recorded changes yet.