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CVE-2015-5296

18
FAUCET Score

CVE-2015-5296 describes a man-in-the-middle vulnerability in Samba versions 3.x and 4.x, affecting various distributions including Canonical and Debian. This flaw allows attackers to downgrade encrypted but unsigned connections to unencrypted ones by manipulating the data stream. Rated Medium severity (CVSS 5.4), it requires high attack complexity but could lead to limited confidentiality and integrity impact without user interaction. There is no evidence of active exploitation, public exploit code, or significant community discussion for this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
>= 3.2.0, < 4.1.22CPE matchmatch criteria
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
>= 4.2.0, < 4.2.7CPE matchmatch criteria
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
>= 4.3.0, < 4.3.3CPE matchmatch criteria
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.4MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
7.26%
Probability of exploitation in next 30 days
EPSS Percentile
93.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0726 is in the 93rd percentile among its peer group of 19,958 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: samba4-0:4.0.0-67.el6_7.rc4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: samba-0:3.6.23-24.el6_7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: samba-0:4.2.3-11.el7_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Gluster Storage 3.1 for RHEL 6Fixed in: samba-0:4.1.17-16.el6rhs
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Gluster Storage 3.1 for RHEL 7Fixed in: samba-0:4.2.4-9.1.el7rhgs
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: samba3x

Vendor Advisories (1)

redhatCVE-2015-5296Moderate

samba: client requesting encryption vulnerable to downgrade attack

Dec 16, 2015

References

lists.fedoraproject.org / pipermail/package-announce/2015-December/174076.html
Mailing ListThird Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2015-December/174391.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2015-12/msg00019.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2015-12/msg00020.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2015-12/msg00032.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2015-12/msg00033.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2016-01/msg00002.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2016-01/msg00017.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2016-04/msg00042.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2016-04/msg00047.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2016-04/msg00048.html
Mailing ListThird Party Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party Advisory
git.samba.org
git.samba.org
git.samba.org
h20566.www2.hpe.com / portal/site/hpsc/public/kb/docDisplay
Third Party Advisory
security.gentoo.org / glsa/201612-47
Third Party Advisory
samba.org / samba/security/CVE-2015-5296.html
Vendor Advisory
debian.org / security/2016/dsa-3433
Third Party Advisory
oracle.com / technetwork/topics/security/bulletinjan2016-2867206.html
Third Party Advisory
oracle.com / technetwork/topics/security/linuxbulletinjan2016-2867209.html
Third Party Advisory
securityfocus.com / bid/79732
Third Party AdvisoryVDB Entry
securitytracker.com / id/1034493
Third Party AdvisoryVDB Entry
ubuntu.com / usn/USN-2855-1
Third Party Advisory
ubuntu.com / usn/USN-2855-2
Third Party Advisory