---
title: "CVE-2017-6309\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-2017-6309?format=md
keywords: index, follow
---

# CVE-2017-6309

Publication date 24 February 2017

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**7.8 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2017-6309?format=md#impact-score)

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## Description

An issue was discovered in tnef before 1.4.13. Two type confusions have
been identified in the parse\_file() function. These might lead to invalid
read and write operations, controlled by an attacker.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| tnef | 17.04 zesty | Fixed 1.4.12-1ubuntu0.1 |
| 16.10 yakkety | Fixed 1.4.9-1+deb8u2build0.16.10.1 |
| 16.04 LTS xenial | Fixed 1.4.9-1+deb8u2build0.16.04.1 |
| 14.04 LTS trusty | Fixed 1.4.9-1+deb8u2build0.14.04.1 |
| 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)
* [Patch details](https://ubuntu.com/security/CVE-2017-6309?format=md#patch-details)

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| tnef | * Upstream:   [8dccf79](https://github.com/verdammelt/tnef/commit/8dccf79857ceeb7a6d3e42c1e762e7b865d5344d) |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

7.8 · High

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.8 · High |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-6309)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2017-6309)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2017-6309)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2017-6309)

### Other references

* <https://www.x41-dsec.de/lab/advisories/x41-2017-004-tnef/>
* <https://github.com/verdammelt/tnef/blob/master/ChangeLog>
* <https://github.com/verdammelt/tnef/commit/8dccf79857ceeb7a6d3e42c1e762e7b865d5344d>
* <https://www.cve.org/CVERecord?id=CVE-2017-6309>