CVE-2018-16851

MEDIUM
6.5
CVSS Score
Published: November 28, 2018 at 02:00 PM UTC
Updated: June 17, 2026 at 01:44 AM UTC
3 products affected across 3 vendorsDebian LinuxUbuntu LinuxSAMBA

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Severity
MEDIUM6.5
Exploit prediction
EPSS 3%

Description

Samba from version 4.0.0 and before versions 4.7.12, 4.8.7, 4.9.3 is vulnerable to a denial of service. During the processing of an LDAP search before Samba's AD DC returns the LDAP entries to the client, the entries are cached in a single memory object with a maximum size of 256MB. When this size is reached, the Samba process providing the LDAP service will follow the NULL pointer, terminating the process. There is no further vulnerability associated with this issue, merely a denial of service.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

4.0.0 ≤ v < 4.7.124.8.0 ≤ v < 4.8.74.9.0 ≤ v < 4.9.34.7.124.8.74.9.3
Affected range stops below 4.7.12, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.8.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.9.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (9)

VDB Entryx_refsource_BIDThird Party Advisory
http://www.securityfocus.com/bid/106027
x_refsource_CONFIRMIssue TrackingThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16851
Mailing Listx_refsource_MLISTThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/12/msg00005.html
Vendor Advisoryx_refsource_GENTOOThird Party Advisory
https://security.gentoo.org/glsa/202003-52
Vendor Advisoryx_refsource_UBUNTUThird Party Advisory
https://usn.ubuntu.com/3827-1/
Vendor Advisoryx_refsource_UBUNTUThird Party Advisory
https://usn.ubuntu.com/3827-2/
Vendor Advisoryx_refsource_DEBIANThird Party Advisory
https://www.debian.org/security/2018/dsa-4345

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-476

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