No exploitation reportedFix available

CVE-2018-1140

Q: Is CVE-2018-1140 actively exploited?

Active exploitation of CVE-2018-1140 has not been confirmed. Its EPSS score was 10.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2018-1140?

CVE-2018-1140 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2018-08-22
Fixed in4.8.4
WeaknessCWE-20

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A missing input sanitization flaw was found in the implementation of LDP database used for the LDAP server. An attacker could use this flaw to cause a denial of service against a samba server, used as a Active Directory Domain Controller. All versions of Samba from 4.8.0 onwards are vulnerable

Timeline

dates in UTC

2018-08-2214:29CVE publishedNVD
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-1140?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-1140?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Samba

Branch	Affected	Fixed in	Source
4.8	≥ 4.8.0, < 4.8.4	4.8.4	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Samba to 4.8.4

Advisories and patches

bugzilla.redhat.comPatch
bugzilla.samba.orgPatch
www.samba.orgPatch · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CNACVSS 3.06.5read 2026-10-23
NVDCVSS 3.06.5read 2026-10-23
NVDCVSS 2.03.3read 2026-10-23
CNAweakness (CWE)CWE-20read 2026-10-23
NVDweakness (CWE)CWE-20read 2026-10-23
FIRST EPSSEPSS score10.8 %read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2018-08-22
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2018-1140?

Is CVE-2018-1140 actively exploited?

Active exploitation of CVE-2018-1140 has not been confirmed. Its EPSS score was 10.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-1140?

CVE-2018-1140 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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