---
title: "CVE-2016-1000339\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-2016-1000339?format=md
keywords: index, follow
---

# CVE-2016-1000339

Publication date 4 June 2018

Last updated 26 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**5.3 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2016-1000339?format=md#impact-score)

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## Description

In the Bouncy Castle JCE Provider version 1.55 and earlier the primary
engine class used for AES was AESFastEngine. Due to the highly table driven
approach used in the algorithm it turns out that if the data channel on the
CPU can be monitored the lookup table accesses are sufficient to leak
information on the AES key being used. There was also a leak in AESEngine
although it was substantially less. AESEngine has been modified to remove
any signs of leakage (testing carried out on Intel X86-64) and is now the
primary AES class for the BC JCE provider from 1.56. Use of AESFastEngine
is now only recommended where otherwise deemed appropriate.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| bouncycastle | 26.04 LTS resolute | Not affected |
| 25.10 questing | Not affected |
| 25.04 plucky | Not affected |
| 24.10 oracular | Not affected |
| 24.04 LTS noble | Not affected |
| 23.10 mantic | Not affected |
| 23.04 lunar | Not affected |
| 22.10 kinetic | Not affected |
| 22.04 LTS jammy | Not affected |
| 21.10 impish | Not affected |
| 21.04 hirsute | Not affected |
| 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 |
| 16.04 LTS xenial | Vulnerable |
| 14.04 LTS trusty | Fixed 1.49+dfsg-2ubuntu0.1 |

---

* [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-2016-1000339?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 |
| --- | --- |
| bouncycastle | * Upstream:   [413b42f](https://github.com/bcgit/bc-java/commit/413b42f4d770456508585c830cfcde95f9b0e93b) * Upstream:   [8a73f08](https://github.com/bcgit/bc-java/commit/8a73f08931450c17c749af067b6a8185abdfd2c0) |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

5.3 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.3 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1000339)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2016-1000339)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2016-1000339)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2016-1000339)

### Related Ubuntu Security Notices (USN)

+ [USN-3727-1](https://usn.ubuntu.com/USN-3727-1)
+ Bouncy Castle vulnerabilities
+ 1 August 2018

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2016-1000339>