CVE-2018-16851
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.
Does this matter?
Lower severity and a low EPSS score (3.25%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 3.25% probability · 88th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- samba/samba · canonical/ubuntu linux · debian/debian linux
- Source
- secalert@redhat.com
EPSS 3.3% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/106027Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16851Issue Tracking, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/12/msg00005.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202003-52Third Party Advisory
- https://security.netapp.com/advisory/ntap-20181127-0001/Third Party Advisory
- https://usn.ubuntu.com/3827-1/Third Party Advisory
- https://usn.ubuntu.com/3827-2/Third Party Advisory
- https://www.debian.org/security/2018/dsa-4345Third Party Advisory
- https://www.samba.org/samba/security/CVE-2018-16851.htmlPatch, Vendor Advisory
- http://www.securityfocus.com/bid/106027Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16851Issue Tracking, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/12/msg00005.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202003-52Third Party Advisory
- https://security.netapp.com/advisory/ntap-20181127-0001/Third Party Advisory
- https://usn.ubuntu.com/3827-1/Third Party Advisory
- https://usn.ubuntu.com/3827-2/Third Party Advisory
- https://www.debian.org/security/2018/dsa-4345Third Party Advisory
- https://www.samba.org/samba/security/CVE-2018-16851.htmlPatch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.