---
title: "CVE-2019-3814\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-2019-3814?format=md
keywords: index, follow
---

# CVE-2019-3814

Publication date 5 February 2019

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**6.8 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2019-3814?format=md#impact-score)

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## Description

It was discovered that Dovecot before versions 2.2.36.1 and 2.3.4.1
incorrectly handled client certificates. A remote attacker in possession of
a valid certificate with an empty username field could possibly use this
issue to impersonate other users.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| dovecot | 18.10 cosmic | Fixed 1:2.3.2.1-1ubuntu3.1 |
| 18.04 LTS bionic | Fixed 1:2.2.33.2-1ubuntu4.2 |
| 16.04 LTS xenial | Fixed 1:2.2.22-1ubuntu2.9 |
| 14.04 LTS trusty | Fixed 1:2.2.9-1ubuntu2.5 |

---

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

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

6.8 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.8 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-3814)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2019-3814)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2019-3814)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2019-3814)

### Related Ubuntu Security Notices (USN)

+ [USN-3881-1](https://usn.ubuntu.com/USN-3881-1)
+ Dovecot vulnerability
+ 5 February 2019

+ [USN-3881-2](https://usn.ubuntu.com/USN-3881-2)
+ Dovecot vulnerability
+ 5 February 2019

### Other references

* <https://www.dovecot.org/pipermail/dovecot/2019-February/114575.html>
* <https://www.cve.org/CVERecord?id=CVE-2019-3814>