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Vulnerability record · CVE-2015-5296 · published 29 December 2015

CVE-2015-5296: Samba improper input validation vulnerability

Samba · Samba

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.

5.4 CVSS 3.1 Medium EPSS 7.3% · top 5.9% CWE-20 · Improper input validation
5.4CVSS 3.1 base score, v2 4.3
7.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
50References
17 Jun 2026Last modified by NVD

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.

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174076.html Mailing ListThird Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174391.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00019.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00020.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00032.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00033.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00002.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00017.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00042.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00047.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00048.html Mailing ListThird Party Advisory
http://www.debian.org/security/2016/dsa-3433 Third Party Advisory
http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html Third Party Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html Third Party Advisory
http://www.securityfocus.com/bid/79732 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1034493 Third Party AdvisoryVDB Entry
http://www.ubuntu.com/usn/USN-2855-1 Third Party Advisory
http://www.ubuntu.com/usn/USN-2855-2 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1290292 Issue TrackingThird Party Advisory
https://git.samba.org/?p=samba.git%3Ba=commit%3Bh=1ba49b8f389eda3414b14410c7fbcb4041ca06b1
https://git.samba.org/?p=samba.git%3Ba=commit%3Bh=a819d2b440aafa3138d95ff6e8b824da885a70e9
https://git.samba.org/?p=samba.git%3Ba=commit%3Bh=d724f835acb9f4886c0001af32cd325dbbf1f895
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05115993 Third Party Advisory
https://security.gentoo.org/glsa/201612-47 Third Party Advisory
https://www.samba.org/samba/security/CVE-2015-5296.html Vendor Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174076.html Mailing ListThird Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174391.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00019.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00020.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00032.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00033.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00002.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00017.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00042.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00047.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00048.html Mailing ListThird Party Advisory
http://www.debian.org/security/2016/dsa-3433 Third Party Advisory
http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html Third Party Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html Third Party Advisory
http://www.securityfocus.com/bid/79732 Third Party AdvisoryVDB Entry

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Source: NIST National Vulnerability Database (record CVE-2015-5296), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.