CVE-2016-2118

Name: CVE-2016-2118
Creator: NVD / NIST
Published: 2016-04-12T23:59:37.497+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 37.04%

Last modified Jun 17, 2026

CVE-2016-2118 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The MS-SAMR and MS-LSAD protocol implementations in Samba 3.x and 4.x before 4.2.11, 4.3.x before 4.3.8, and 4.4.x before 4.4.2 mishandle DCERPC connections, which allows man-in-the-middle attackers to perform protocol-downgrade attacks and impersonate users by modifying the client-server data stream, aka "BADLOCK.". EPSS estimates a 37.04% chance of exploitation in the next 30 days.

Description

The MS-SAMR and MS-LSAD protocol implementations in Samba 3.x and 4.x before 4.2.11, 4.3.x before 4.3.8, and 4.4.x before 4.4.2 mishandle DCERPC connections, which allows man-in-the-middle attackers to perform protocol-downgrade attacks and impersonate users by modifying the client-server data stream, aka "BADLOCK."

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

37.04%

98.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-254

Affected Software

Vendor	Product	Versions
Samba	Samba	>= 3.6.0, < 4.2.10
Samba	Samba	>= 4.3.0, < 4.3.7
Samba	Samba	>= 4.4.0, < 4.4.1
Canonical	Ubuntu Linux	12.04
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	15.10
Canonical	Ubuntu Linux	16.04
Debian	Debian Linux	7.0
Debian	Debian Linux	8.0

References

http://badlock.org/Technical Description, Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182185.htmlMailing List, Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182272.htmlMailing List, Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182288.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00020.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00021.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00022.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00023.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00024.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00042.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00047.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00048.htmlMailing List, Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-0611.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-0612.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-0613.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-0614.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-0618.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-0619.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-0620.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-0621.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-0623.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-0624.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-0625.htmlThird Party Advisory
http://www.debian.org/security/2016/dsa-3548Third Party Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.htmlThird Party Advisory
http://www.securityfocus.com/bid/86002Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1035533Third Party Advisory, VDB Entry
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.458012Mailing List, Third Party Advisory
http://www.ubuntu.com/usn/USN-2950-1Third Party Advisory
http://www.ubuntu.com/usn/USN-2950-2Third Party Advisory
http://www.ubuntu.com/usn/USN-2950-3Third Party Advisory
http://www.ubuntu.com/usn/USN-2950-4Third Party Advisory
http://www.ubuntu.com/usn/USN-2950-5Third Party Advisory
https://access.redhat.com/security/vulnerabilities/badlockThird Party Advisory
https://bto.bluecoat.com/security-advisory/sa122Third Party Advisory
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05162399Third Party Advisory
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05166182Third Party Advisory
https://help.ecostruxureit.com/display/public/UADCO8x/StruxureWare+Data+Center+Operation+Software+Vulnerability+FixesThird Party Advisory
https://kb.netapp.com/support/s/article/ka51A0000008SXzQAM/smb-vulnerabilities-in-multiple-netapp-productsThird Party Advisory
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40196Third Party Advisory
https://security.gentoo.org/glsa/201612-47Third Party Advisory
https://www.kb.cert.org/vuls/id/813296Third Party Advisory, US Government Resource
https://www.samba.org/samba/history/samba-4.2.10.htmlThird Party Advisory
https://www.samba.org/samba/latest_news.html#4.4.2Vendor Advisory
https://www.samba.org/samba/security/CVE-2016-2118.htmlVendor Advisory
http://badlock.org/Technical Description, Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182185.htmlMailing List, Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182272.htmlMailing List, Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182288.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00020.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00021.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00022.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00023.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00024.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00042.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00047.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00048.htmlMailing List, Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-0611.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-0612.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-0613.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-0614.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-0618.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-0619.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-0620.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-0621.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-0623.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-0624.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-0625.htmlThird Party Advisory
http://www.debian.org/security/2016/dsa-3548Third Party Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.htmlThird Party Advisory
http://www.securityfocus.com/bid/86002Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1035533Third Party Advisory, VDB Entry
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.458012Mailing List, Third Party Advisory
http://www.ubuntu.com/usn/USN-2950-1Third Party Advisory
http://www.ubuntu.com/usn/USN-2950-2Third Party Advisory
http://www.ubuntu.com/usn/USN-2950-3Third Party Advisory
http://www.ubuntu.com/usn/USN-2950-4Third Party Advisory
http://www.ubuntu.com/usn/USN-2950-5Third Party Advisory
https://access.redhat.com/security/vulnerabilities/badlockThird Party Advisory
https://bto.bluecoat.com/security-advisory/sa122Third Party Advisory
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05162399Third Party Advisory
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05166182Third Party Advisory
https://help.ecostruxureit.com/display/public/UADCO8x/StruxureWare+Data+Center+Operation+Software+Vulnerability+FixesThird Party Advisory
https://kb.netapp.com/support/s/article/ka51A0000008SXzQAM/smb-vulnerabilities-in-multiple-netapp-productsThird Party Advisory
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40196Third Party Advisory
https://security.gentoo.org/glsa/201612-47Third Party Advisory
https://www.kb.cert.org/vuls/id/813296Third Party Advisory, US Government Resource
https://www.samba.org/samba/history/samba-4.2.10.htmlThird Party Advisory
https://www.samba.org/samba/latest_news.html#4.4.2Vendor Advisory
https://www.samba.org/samba/security/CVE-2016-2118.htmlVendor Advisory

Timeline

Published: Apr 12, 2016
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2016-2118?

How severe is CVE-2016-2118?

CVE-2016-2118 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 37.04% probability of exploitation in the next 30 days.

How do I fix CVE-2016-2118?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2016-2118?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST