---
title: "CVE-2017-6303\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-2017-6303?format=md
keywords: index, follow
---

# CVE-2017-6303

Publication date 23 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-2017-6303?format=md#impact-score)

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## Description

An issue was discovered in ytnef before 1.9.1. This is related to a patch
described as "6 of 9. Invalid Write and Integer Overflow."

[Read the notes from the security team](https://ubuntu.com/security/CVE-2017-6303?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| libytnef | 20.10 groovy | Not affected |
| 20.04 LTS focal | Not affected |
| 19.10 eoan | Not affected |
| 19.04 disco | Not affected |
| 18.10 cosmic | Not affected |
| 18.04 LTS bionic | Not affected |
| 17.10 artful | Not affected |
| 17.04 zesty | Not affected |
| 16.10 yakkety | Ignored end of life |
| 16.04 LTS xenial | Fixed 1.5-9ubuntu0.1 |
| 14.04 LTS trusty | Fixed 1.5-6ubuntu0.1 |
| 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-2017-6303?format=md#patch-details)

## Notes

---

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

rather than cherry-pick individual commits, probably best to
take full git merge commit

### 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 |
| --- | --- |
| libytnef | * Upstream:   [b36d6b2](https://github.com/Yeraze/ytnef/commit/b36d6b25b7a546fc28d6c3812124e487987a4910) |

## 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-2017-6303)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2017-6303)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2017-6303)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2017-6303)

### Related Ubuntu Security Notices (USN)

+ [USN-3288-1](https://usn.ubuntu.com/USN-3288-1)
+ libytnef vulnerabilities
+ 15 May 2017

+ [USN-4615-1](https://usn.ubuntu.com/USN-4615-1)
+ Yerase's TNEF vulnerabilities
+ 3 November 2020

### Other references

* <https://www.x41-dsec.de/lab/advisories/x41-2017-002-ytnef/>
* <http://www.openwall.com/lists/oss-security/2017/02/15/4>
* <https://github.com/Yeraze/ytnef/pull/27>
* <https://www.cve.org/CVERecord?id=CVE-2017-6303>