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CVE-2019-12436

Samba 4.10.x before 4.10.5 has a NULL pointer dereference, leading to an AD DC LDAP server Denial...

6.5 MediumFix available

Samba 4.10.x before 4.10.5 has a NULL pointer dereference, leading to an AD DC LDAP server Denial of Service. This is related to an attacker using the paged search control. The attacker must have directory read access in order to attempt an exploit.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

2.79%Up 1.2 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 6.5

Samba 4.10.x before 4.10.5 has a NULL pointer dereference, leading to an AD DC LDAP server Denial of Service. This is related to an attacker using the paged search control. The attacker must have directory read access in order to attempt an exploit.

Record
CVE-2019-12436
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
4.0 MediumAV:N/AC:L/Au:S/C:N/I:N/A:P
Weakness
CWE-476
Updated
2026-11-02
CVE List No score

Samba 4.10.x before 4.10.5 has a NULL pointer dereference, leading to an AD DC LDAP server Denial of Service. This is related to an attacker using the paged search control. The attacker must have directory read access in order to attempt an exploit.

Record
CVE-2019-12436
Updated
2026-11-02
EUVDEUVD-2019-4046 No score

Samba 4.10.x before 4.10.5 has a NULL pointer dereference, leading to an AD DC LDAP server Denial of Service. This is related to an attacker using the paged search control. The attacker must have directory read access in order to attempt an exploit.

Record
EUVD-2019-4046
Updated
2026-11-03
GitHub AdvisoriesGHSA-8c68-g8rx-85g8 No score

Samba 4.10.x before 4.10.5 has a NULL pointer dereference, leading to an AD DC LDAP server Denial...

Samba 4.10.x before 4.10.5 has a NULL pointer dereference, leading to an AD DC LDAP server Denial of Service. This is related to an attacker using the paged search control. The attacker must have directory read access in order to attempt an exploit.

Record
GHSA-8c68-g8rx-85g8
Updated
2026-11-02
OSVALPINE-CVE-2019-12436 6.5

Samba 4.10.x before 4.10.5 has a NULL pointer dereference, leading to an AD DC LDAP server Denial of Service. This is related to an attacker using the paged search control. The attacker must have directory read access in order to attempt an exploit.

Record
ALPINE-CVE-2019-12436
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSV 6.5

Samba 4.10.x before 4.10.5 has a NULL pointer dereference, leading to an AD DC LDAP server Denial of Service. This is related to an attacker using the paged search control. The attacker must have directory read access in order to attempt an exploit.

Record
CVE-2019-12436
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2019-12436 6.5

Samba 4.10.x before 4.10.5 has a NULL pointer dereference, leading to an AD DC LDAP server Denial of Service. This is related to an attacker using the paged search control. The attacker must have directory read access in order to attempt an exploit.

Record
UBUNTU-CVE-2019-12436
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVMGASA-2019-0286 No score

Updated samba packages fix security vulnerabilities

Updated samba packages fix security vulnerabilities:

A combination of parameters and permissions in smb.conf can allow user to escape from the share path definition (CVE-2019-10197).

An authenticated user can crash the Samba AD DC's RPC server process via a NULL pointer dereference (CVE-2019-12435)

An user with read access to the directory can cause a NULL pointer dereference using the paged search control (CVE-2019-12436).

For other fixes in this update, see the referenced changelogs.

Record
MGASA-2019-0286
Updated
2026-11-02
OSVopenSUSE-SU-2024:11365-1 No score

ctdb-4.14.6+git.182.2205d5224e3-1.1 on GA media

These are all security issues fixed in the ctdb-4.14.6+git.182.2205d5224e3-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11365-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
samba
Alpine:v3.10
4.10.0 up to 4.10.5-r0
4.10.5-r0
samba
Alpine:v3.11
4.10.0 up to 4.10.5-r0
4.10.5-r0
samba
Alpine:v3.12
4.10.0 up to 4.10.5-r0
4.10.5-r0
samba
Alpine:v3.13
4.10.0 up to 4.10.5-r0
4.10.5-r0
samba
Alpine:v3.14
4.10.0 up to 4.10.5-r0
4.10.5-r0
samba
Alpine:v3.15
4.10.0 up to 4.10.5-r0
4.10.5-r0
samba
Alpine:v3.16
4.10.0 up to 4.10.5-r0
4.10.5-r0
samba
Alpine:v3.17
4.10.0 up to 4.10.5-r0
4.10.5-r0
samba
Alpine:v3.18
4.10.0 up to 4.10.5-r0
4.10.5-r0
samba
Alpine:v3.19
4.10.0 up to 4.10.5-r0
4.10.5-r0
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Affected packages
PackageAffectedFixed
samba
Alpine:v3.20
4.10.0 up to 4.10.5-r0
4.10.5-r0
samba
Alpine:v3.21
4.10.0 up to 4.10.5-r0
4.10.5-r0
samba
Alpine:v3.22
4.10.0 up to 4.10.5-r0
4.10.5-r0
samba
Alpine:v3.23
4.10.0 up to 4.10.5-r0
4.10.5-r0
samba
Alpine:v3.24
4.10.0 up to 4.10.5-r0
4.10.5-r0
samba
Mageia:7
From an advisory covering 3 CVEs
before 4.10.8-3.mga7
4.10.8-3.mga7
ldb
Mageia:7
From an advisory covering 3 CVEs
before 1.5.5-1.mga7
1.5.5-1.mga7
samba
openSUSE:Tumbleweed
From an advisory covering 66 CVEs
before 4.14.6+git.182.2205d5224e3-1.1
4.14.6+git.182.2205d5224e3-1.1

History

History
RecordedChangedSources
affected, facts
affected
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-12436 is a medium vulnerability (CVSS 6.5) in Samba, published June 19, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.79%, the 86th percentile. Fixed in samba 4.10.5-r0.

References

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