---
title: "CVE-2017-3731\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-2017-3731?format=md
keywords: index, follow
---

# CVE-2017-3731

Publication date 26 January 2017

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**7.5 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2017-3731?format=md#impact-score)

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## Description

If an SSL/TLS server or client is running on a 32-bit host, and a specific
cipher is being used, then a truncated packet can cause that server or
client to perform an out-of-bounds read, usually resulting in a crash. For
OpenSSL 1.1.0, the crash can be triggered when using CHACHA20/POLY1305;
users should upgrade to 1.1.0d. For Openssl 1.0.2, the crash can be
triggered when using RC4-MD5; users who have not disabled that algorithm
should update to 1.0.2k.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| openssl | 19.04 disco | Fixed 1.0.2g-1ubuntu11 |
| 18.10 cosmic | Fixed 1.0.2g-1ubuntu11 |
| 18.04 LTS bionic | Fixed 1.0.2g-1ubuntu11 |
| 17.10 artful | Fixed 1.0.2g-1ubuntu11 |
| 17.04 zesty | Fixed 1.0.2g-1ubuntu11 |
| 16.10 yakkety | Fixed 1.0.2g-1ubuntu9.1 |
| 16.04 LTS xenial | Fixed 1.0.2g-1ubuntu4.6 |
| 14.04 LTS trusty | Fixed 1.0.1f-1ubuntu2.22 |
| 12.04 LTS precise | Fixed 1.0.1-4ubuntu5.39 |
| openssl098 | 19.04 disco | Not in release |
| 18.10 cosmic | Not in release |
| 18.04 LTS bionic | Not in release |
| 17.10 artful | Not in release |
| 17.04 zesty | Not in release |
| 16.10 yakkety | Not in release |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| 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-2017-3731?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 |
| --- | --- |
| openssl | * Upstream:   <https://git.openssl.org/?p=openssl.git;a=commit;h=1a3701f4fe0530a40ec073cd78d02cfcc26c0f8e> * Upstream:   <https://git.openssl.org/?p=openssl.git;a=commit;h=51d009043670a627d6abe66894126851cf3690e9> * Upstream:   <https://git.openssl.org/?p=openssl.git;a=commit;h=f3a7e57c92b2c9b87dc4b2997f2ebda6781300d0> * Upstream:   <https://git.openssl.org/?p=openssl.git;a=commit;h=00d965474b22b54e4275232bc71ee0c699c5cd21> |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

7.5 · High

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.5 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-3731)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2017-3731)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2017-3731)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2017-3731)

### Related Ubuntu Security Notices (USN)

+ [USN-3181-1](https://usn.ubuntu.com/USN-3181-1)
+ OpenSSL vulnerabilities
+ 31 January 2017

### Other references

* <https://www.openssl.org/news/secadv/20170126.txt>
* <https://www.cve.org/CVERecord?id=CVE-2017-3731>