---
title: "CVE-2018-1140\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2018-1140?format=md
keywords: index, follow
---

# CVE-2018-1140

Publication date 14 August 2018

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**6.5 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2018-1140?format=md#impact-score)

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## 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

[Read the notes from the security team](https://ubuntu.com/security/CVE-2018-1140?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| samba | 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not affected |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Notes

---

### [mdeslaur](https://launchpad.net/~mdeslaur)

4.8.0+ only

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

6.5 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Adjacent |
  | Attack complexity | Low |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | None |
  | Integrity impact | None |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.5 · Medium |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-1140)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2018-1140)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2018-1140)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2018-1140)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2018-1140>