CVE-2016-2111

CVE-2016-2111 is a medium-severity vulnerability in Samba with a CVSS 3.x base score of 6.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-254.

Key facts

• Severity: Medium (CVSS 3.x base score 6.3)
• CVSS v2: 4.3
• EPSS exploit prediction: 3% (85th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-254
• Affected product: Samba
• Published: 2016-04-25
• Last modified: 2026-06-17

Description

The NETLOGON service 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, when a domain controller is configured, allows remote attackers to spoof the computer name of a secure channel's endpoint, and obtain sensitive session information, by running a crafted application and leveraging the ability to sniff network traffic, a related issue to CVE-2015-0005.

Frequently asked questions

What is CVE-2016-2111?

The NETLOGON service 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, when a domain controller is configured, allows remote attackers to spoof the computer name of a secure channel's endpoint, and obtain sensitive session information, by running a crafted application and leveraging the ability to sniff network traffic, a related issue to CVE-2015-0005.

How severe is CVE-2016-2111?

CVE-2016-2111 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over local access with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2016-2111 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-2111?

CVE-2016-2111 primarily affects Samba. In total, 251 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-2111?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2016-2111 published?

CVE-2016-2111 was published on 2016-04-25 and last updated on 2026-06-17.

References

• http://badlock.org/
• http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182185.html
• http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182272.html
• http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182288.html
• http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00020.html
• http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00021.html
• http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00022.html
• http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00023.html
• http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00024.html
• http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00042.html
• http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00046.html
• http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00047.html
• http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00048.html
• http://rhn.redhat.com/errata/RHSA-2016-0611.html
• http://rhn.redhat.com/errata/RHSA-2016-0612.html
• http://rhn.redhat.com/errata/RHSA-2016-0613.html
• http://rhn.redhat.com/errata/RHSA-2016-0614.html
• http://rhn.redhat.com/errata/RHSA-2016-0618.html
• http://rhn.redhat.com/errata/RHSA-2016-0619.html
• http://rhn.redhat.com/errata/RHSA-2016-0620.html
• http://rhn.redhat.com/errata/RHSA-2016-0621.html
• http://rhn.redhat.com/errata/RHSA-2016-0623.html
• http://rhn.redhat.com/errata/RHSA-2016-0624.html
• http://rhn.redhat.com/errata/RHSA-2016-0625.html
• http://www.debian.org/security/2016/dsa-3548
• http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
• http://www.securitytracker.com/id/1035533
• http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.458012
• http://www.ubuntu.com/usn/USN-2950-1
• http://www.ubuntu.com/usn/USN-2950-2

Affected products (251)

• cpe:2.3:a:samba:samba:3.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.2:a:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.2a:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.4:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.4:rc1:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.5:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.6:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.7:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.8:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.9:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.10:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.11:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.12:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.13:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.14:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.14:a:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.14a:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.15:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.16:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.17:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.18:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.19:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.20:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.20:a:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.20:b:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.20a:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.20b:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.21:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.21:a:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.21:b:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.21:c:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.21a:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.21b:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.21c:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.22:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.23:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.0.23:a:*:*:*:*:*:*

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