---
title: "CVE-2015-3644\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-2015-3644?format=md
keywords: index, follow
---

# CVE-2015-3644

Publication date 14 May 2015

Last updated 24 July 2024

---

Ubuntu priority

**Medium**

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

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## Description

Stunnel 5.00 through 5.13, when using the redirect option, does not
redirect client connections to the expected server after the initial
connection, which allows remote attackers to bypass authentication.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2015-3644?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| stunnel4 | 18.10 cosmic | Not affected |
| 18.04 LTS bionic | Not affected |
| 17.10 artful | Not affected |
| 17.04 zesty | Not affected |
| 16.10 yakkety | Not affected |
| 16.04 LTS xenial | Not affected |
| 15.10 wily | Not affected |
| 15.04 vivid | Fixed 3:5.06-2+deb8u1build0.15.04.1 |
| 14.10 utopic | Ignored end of life |
| 14.04 LTS trusty | Not affected |
| 12.04 LTS precise | Ignored end of life |

---

* [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

---

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

possibly does not affect 4.x based on stunnel advisory

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3644)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2015-3644)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2015-3644)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2015-3644)

### Other references

* <https://www.stunnel.org/CVE-2015-3644.html>
* <https://www.cve.org/CVERecord?id=CVE-2015-3644>