---
title: "CVE-2019-12436\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-2019-12436?format=md
keywords: index, follow
---

# CVE-2019-12436

Publication date 19 June 2019

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-2019-12436?format=md#impact-score)

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## Description

Samba 4.10.x before 4.10.5 has a NULL pointer dereference, leading to an AD
DC LDAP server Denial of Service. This is related to an attacker using the
paged search control. The attacker must have directory read access in order
to attempt an exploit.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2019-12436?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| samba | 19.04 disco | Fixed 2:4.10.0+dfsg-0ubuntu2.2 |
| 18.10 cosmic | Not affected |
| 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)

4.10 only

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

6.5 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | Low |
  | 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:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12436)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2019-12436)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2019-12436)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2019-12436)

### Related Ubuntu Security Notices (USN)

+ [USN-4018-1](https://usn.ubuntu.com/USN-4018-1)
+ Samba vulnerabilities
+ 19 June 2019

### Other references

* <https://www.samba.org/samba/security/CVE-2019-12436.html>
* <https://www.cve.org/CVERecord?id=CVE-2019-12436>