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Servers and applications

CVE-2016-2110

The NTLMSSP authentication implementation 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 allows man-in-the-middle attackers to perform protocol-downgrade attacks by modifying the client-server data stream to remove application-layer flags or encryption settings, as demonstrated by clearing the NTLMSSP_NEGOTIATE_SEAL or NTLMSSP_NEGOTIATE_SIGN option to disrupt LDAP…

Severity
Medium 5.9
Published
25 Apr 2016
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
8.3% in the next 30 daysHigher than 95% of CVEs. EPSS by FIRST, 11 Nov 2026
Weakness
CWE-254
Attack
Over the network · Only under certain conditions · No login needed · No user action needed
Attacker can
Change data
CVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Sources
NVD

Description

The NTLMSSP authentication implementation 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 allows man-in-the-middle attackers to perform protocol-downgrade attacks by modifying the client-server data stream to remove application-layer flags or encryption settings, as demonstrated by clearing the NTLMSSP_NEGOTIATE_SEAL or NTLMSSP_NEGOTIATE_SIGN option to disrupt LDAP security.

From NVD.

Affected software

SoftwareAffected versions
SambaServers and applications · cpe:a:samba:samba
  • Version 4.4.0
  • Version 4.3.6
  • Version 4.3.5
  • Version 4.3.4
All 248 release lines
  • Version 3.0.0
  • Version 3.0.1
  • Version 3.0.2-a
  • Version 3.0.2
  • Version 3.0.2a
  • Version 3.0.3
  • Version 3.0.4-rc1
  • Version 3.0.4
  • Version 3.0.5
  • Version 3.0.6
  • Version 3.0.7
  • Version 3.0.8
  • Version 3.0.9
  • Version 3.0.10
  • Version 3.0.11
  • Version 3.0.12
  • Version 3.0.13
  • Version 3.0.14-a
  • Version 3.0.14
  • Version 3.0.14a
  • Version 3.0.15
  • Version 3.0.16
  • Version 3.0.17
  • Version 3.0.18
  • Version 3.0.19
  • Version 3.0.20-a
  • Version 3.0.20-b
  • Version 3.0.20
  • Version 3.0.20a
  • Version 3.0.20b
  • Version 3.0.21-a
  • Version 3.0.21-b
  • Version 3.0.21-c
  • Version 3.0.21
  • Version 3.0.21a
  • Version 3.0.21b
  • Version 3.0.21c
  • Version 3.0.22
  • Version 3.0.23-a
  • Version 3.0.23-b
  • Version 3.0.23-c
  • Version 3.0.23
  • Version 3.0.23a
  • Version 3.0.23b
  • Version 3.0.23c
  • Version 3.0.23-d
  • Version 3.0.23d
  • Version 3.0.24
  • Version 3.0.25-a
  • Version 3.0.25-b
  • Version 3.0.25-pre1
  • Version 3.0.25-pre2
  • Version 3.0.25-c
  • Version 3.0.25-rc1
  • Version 3.0.25-rc2
  • Version 3.0.25-rc3
  • Version 3.0.25
  • Version 3.0.25a
  • Version 3.0.25b
  • Version 3.0.25c
  • Version 3.0.26-a
  • Version 3.0.26
  • Version 3.0.26a
  • Version 3.0.27-a
  • Version 3.0.27
  • Version 3.0.28-a
  • Version 3.0.28
  • Version 3.0.29
  • Version 3.0.30
  • Version 3.0.31
  • Version 3.0.32
  • Version 3.0.33
  • Version 3.0.34
  • Version 3.0.35
  • Version 3.0.36
  • Version 3.0.37
  • Version 3.2.0
  • Version 3.2.1
  • Version 3.2.2
  • Version 3.2.3
  • Version 3.2.4
  • Version 3.2.5
  • Version 3.2.6
  • Version 3.2.7
  • Version 3.2.8
  • Version 3.2.9
  • Version 3.2.10
  • Version 3.2.11
  • Version 3.2.12
  • Version 3.2.13
  • Version 3.2.14
  • Version 3.2.15
  • Version 3.3.0
  • Version 3.3.1
  • Version 3.3.2
  • Version 3.3.3
  • Version 3.3.4
  • Version 3.3.5
  • Version 3.3.6
  • Version 3.3.7
  • Version 3.3.8
  • Version 3.3.9
  • Version 3.3.10
  • Version 3.3.11
  • Version 3.3.12
  • Version 3.3.13
  • Version 3.3.14
  • Version 3.3.15
  • Version 3.3.16
  • Version 3.4.0
  • Version 3.4.1
  • Version 3.4.2
  • Version 3.4.3
  • Version 3.4.4
  • Version 3.4.5
  • Version 3.4.6
  • Version 3.4.7
  • Version 3.4.8
  • Version 3.4.9
  • Version 3.4.10
  • Version 3.4.11
  • Version 3.4.12
  • Version 3.4.13
  • Version 3.4.14
  • Version 3.4.15
  • Version 3.4.16
  • Version 3.4.17
  • Version 3.5.0
  • Version 3.5.1
  • Version 3.5.2
  • Version 3.5.3
  • Version 3.5.4
  • Version 3.5.5
  • Version 3.5.6
  • Version 3.5.7
  • Version 3.5.8
  • Version 3.5.9
  • Version 3.5.10
  • Version 3.5.11
  • Version 3.5.12
  • Version 3.5.13
  • Version 3.5.14
  • Version 3.5.15
  • Version 3.5.16
  • Version 3.5.17
  • Version 3.5.18
  • Version 3.5.19
  • Version 3.5.20
  • Version 3.5.21
  • Version 3.5.22
  • Version 3.6.0
  • Version 3.6.1
  • Version 3.6.2
  • Version 3.6.3
  • Version 3.6.4
  • Version 3.6.5
  • Version 3.6.6
  • Version 3.6.7
  • Version 3.6.8
  • Version 3.6.9
  • Version 3.6.10
  • Version 3.6.11
  • Version 3.6.12
  • Version 3.6.13
  • Version 3.6.14
  • Version 3.6.15
  • Version 3.6.16
  • Version 3.6.17
  • Version 3.6.18
  • Version 3.6.19
  • Version 3.6.20
  • Version 3.6.21
  • Version 3.6.22
  • Version 3.6.23
  • Version 3.6.24
  • Version 3.6.25
  • Version 4.0.0
  • Version 4.0.1
  • Version 4.0.2
  • Version 4.0.3
  • Version 4.0.4
  • Version 4.0.5
  • Version 4.0.6
  • Version 4.0.7
  • Version 4.0.8
  • Version 4.0.9
  • Version 4.0.10
  • Version 4.0.11
  • Version 4.0.12
  • Version 4.0.13
  • Version 4.0.14
  • Version 4.0.15
  • Version 4.0.16
  • Version 4.0.17
  • Version 4.0.18
  • Version 4.0.19
  • Version 4.0.20
  • Version 4.0.21
  • Version 4.0.22
  • Version 4.0.23
  • Version 4.0.24
  • Version 4.0.25
  • Version 4.0.26
  • Version 4.1.0
  • Version 4.1.1
  • Version 4.1.2
  • Version 4.1.3
  • Version 4.1.4
  • Version 4.1.5
  • Version 4.1.6
  • Version 4.1.7
  • Version 4.1.8
  • Version 4.1.9
  • Version 4.1.10
  • Version 4.1.11
  • Version 4.1.12
  • Version 4.1.13
  • Version 4.1.14
  • Version 4.1.15
  • Version 4.1.16
  • Version 4.1.17
  • Version 4.1.18
  • Version 4.1.19
  • Version 4.1.20
  • Version 4.1.21
  • Version 4.1.22
  • Version 4.1.23
  • Version 4.2.0-rc1
  • Version 4.2.0-rc2
  • Version 4.2.0-rc3
  • Version 4.2.0-rc4
  • Version 4.2.1
  • Version 4.2.2
  • Version 4.2.3
  • Version 4.2.4
  • Version 4.2.5
  • Version 4.2.6
  • Version 4.2.7
  • Version 4.2.8
  • Version 4.2.9
  • Version 4.3.0
  • Version 4.3.1
  • Version 4.3.2
  • Version 4.3.3
  • Version 4.3.4
  • Version 4.3.5
  • Version 4.3.6
  • Version 4.4.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2016-2110
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2016-2110