CVE-2016-2112

CVE-2016-2112 is a medium-severity vulnerability in Samba with a CVSS 3.x base score of 5.9. 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 5.9)
• CVSS v2: 4.3
• EPSS exploit prediction: 9% (95th 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 bundled LDAP client library 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 does not recognize the "client ldap sasl wrapping" setting, which allows man-in-the-middle attackers to perform LDAP protocol-downgrade attacks by modifying the client-server data stream.

Frequently asked questions

What is CVE-2016-2112?

The bundled LDAP client library 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 does not recognize the "client ldap sasl wrapping" setting, which allows man-in-the-middle attackers to perform LDAP protocol-downgrade attacks by modifying the client-server data stream.

How severe is CVE-2016-2112?

CVE-2016-2112 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2016-2112 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-2112?

CVE-2016-2112 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-2016-2112?

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

When was CVE-2016-2112 published?

CVE-2016-2112 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/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-2016-0624.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
• http://www.ubuntu.com/usn/USN-2950-3
• http://www.ubuntu.com/usn/USN-2950-4
• http://www.ubuntu.com/usn/USN-2950-5
• https://bto.bluecoat.com/security-advisory/sa122

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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