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CVE-2018-16852

Samba from version 4.9.0 and before version 4.9.3 is vulnerable to a NULL pointer de-reference....

6.5 MediumFix available

Samba from version 4.9.0 and before version 4.9.3 is vulnerable to a NULL pointer de-reference. During the processing of an DNS zone in the DNS management DCE/RPC server, the internal DNS server or the Samba DLZ plugin for BIND9, if the DSPROPERTY_ZONE_MASTER_SERVERS property or DSPROPERTY_ZONE_SCAVENGING_SERVERS property is set, the server will follow a NULL pointer and terminate. There is no further vulnerability associated with this issue, merely a denial of service.

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

2.23%Up 0.7 points since Apr 14, 2021
90%50%10%1%

What each source reports

CVE List Score used 6.5

Samba from version 4.9.0 and before version 4.9.3 is vulnerable to a NULL pointer de-reference. During the processing of an DNS zone in the DNS management DCE/RPC server, the internal DNS server or the Samba DLZ plugin for BIND9, if the DSPROPERTY_ZONE_MASTER_SERVERS property or DSPROPERTY_ZONE_SCAVENGING_SERVERS property is set, the server will follow a NULL pointer and terminate. There is no further vulnerability associated with this issue, merely a denial of service.

Record
CVE-2018-16852
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-476
Updated
2026-11-02
EUVDEUVD-2018-8646 6.5

Samba from version 4.9.0 and before version 4.9.3 is vulnerable to a NULL pointer de-reference. During the processing of an DNS zone in the DNS management DCE/RPC server, the internal DNS server or the Samba DLZ plugin for BIND9, if the DSPROPERTY_ZONE_MASTER_SERVERS property or DSPROPERTY_ZONE_SCAVENGING_SERVERS property is set, the server will follow a NULL pointer and terminate. There is no further vulnerability associated with this issue, merely a denial of service.

Record
EUVD-2018-8646
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
2026-11-03
GitHub AdvisoriesGHSA-66rc-c89h-v5pc 4.4

Samba from version 4.9.0 and before version 4.9.3 is vulnerable to a NULL pointer de-reference....

Samba from version 4.9.0 and before version 4.9.3 is vulnerable to a NULL pointer de-reference. During the processing of an DNS zone in the DNS management DCE/RPC server, the internal DNS server or the Samba DLZ plugin for BIND9, if the DSPROPERTY_ZONE_MASTER_SERVERS property or DSPROPERTY_ZONE_SCAVENGING_SERVERS property is set, the server will follow a NULL pointer and terminate. There is no further vulnerability associated with this issue, merely a denial of service.

Record
GHSA-66rc-c89h-v5pc
CVSS 3.0
4.4 MediumCVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-476
Updated
2026-11-02
NVD 6.5

Samba from version 4.9.0 and before version 4.9.3 is vulnerable to a NULL pointer de-reference. During the processing of an DNS zone in the DNS management DCE/RPC server, the internal DNS server or the Samba DLZ plugin for BIND9, if the DSPROPERTY_ZONE_MASTER_SERVERS property or DSPROPERTY_ZONE_SCAVENGING_SERVERS property is set, the server will follow a NULL pointer and terminate. There is no further vulnerability associated with this issue, merely a denial of service.

Record
CVE-2018-16852
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 3.0
4.4 MediumCVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
3.5 LowAV:N/AC:M/Au:S/C:N/I:N/A:P
Weakness
CWE-476
Updated
2026-11-02
OSV 4.4

Samba from version 4.9.0 and before version 4.9.3 is vulnerable to a NULL pointer de-reference. During the processing of an DNS zone in the DNS management DCE/RPC server, the internal DNS server or the Samba DLZ plugin for BIND9, if the DSPROPERTY_ZONE_MASTER_SERVERS property or DSPROPERTY_ZONE_SCAVENGING_SERVERS property is set, the server will follow a NULL pointer and terminate. There is no further vulnerability associated with this issue, merely a denial of service.

Record
CVE-2018-16852
CVSS 3.0
4.4 MediumCVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2018-16852 4.4

Samba from version 4.9.0 and before version 4.9.3 is vulnerable to a NULL pointer de-reference. During the processing of an DNS zone in the DNS management DCE/RPC server, the internal DNS server or the Samba DLZ plugin for BIND9, if the DSPROPERTY_ZONE_MASTER_SERVERS property or DSPROPERTY_ZONE_SCAVENGING_SERVERS property is set, the server will follow a NULL pointer and terminate. There is no further vulnerability associated with this issue, merely a denial of service.

Record
DEBIAN-CVE-2018-16852
CVSS 3.0
4.4 MediumCVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
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
Debian:12
 before 2:4.9.2+dfsg-2
2:4.9.2+dfsg-2
samba
Debian:13
 before 2:4.9.2+dfsg-2
2:4.9.2+dfsg-2
samba
Debian:14
 before 2:4.9.2+dfsg-2
2:4.9.2+dfsg-2
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
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2018-16852 is a medium vulnerability (CVSS 6.5) in [unknown] Samba, published November 28, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.23%, the 82nd percentile. Fixed in samba 2:4.9.2+dfsg-2.

References

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