---
title: "CVE-2016-0703\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-2016-0703?format=md
keywords: index, follow
---

# CVE-2016-0703

Publication date 1 March 2016

Last updated 25 August 2025

---

Ubuntu priority

**High**

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

## Cvss 3 Severity Score

**5.9 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2016-0703?format=md#impact-score)

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## Description

The get\_client\_master\_key function in s2\_srvr.c in the SSLv2 implementation
in OpenSSL before 0.9.8zf, 1.0.0 before 1.0.0r, 1.0.1 before 1.0.1m, and
1.0.2 before 1.0.2a accepts a nonzero CLIENT-MASTER-KEY CLEAR-KEY-LENGTH
value for an arbitrary cipher, which allows man-in-the-middle attackers to
determine the MASTER-KEY value and decrypt TLS ciphertext data by
leveraging a Bleichenbacher RSA padding oracle, a related issue to
CVE-2016-0800.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2016-0703?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| openssl | 15.10 wily | Not affected |
| 15.04 vivid | Not affected |
| 14.04 LTS trusty | Not affected |
| 12.04 LTS precise | Not affected |
| openssl098 | 15.10 wily | Not in release |
| 15.04 vivid | Not affected |
| 14.04 LTS trusty | Not in release |
| 12.04 LTS precise | Not affected |

---

* [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

---

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

openssl in Ubuntu is compiled with no-ssl2

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

5.9 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.9 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-0703)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2016-0703)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2016-0703)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2016-0703)

### Other references

* <https://www.openssl.org/news/secadv/20160301.txt>
* <https://www.cve.org/CVERecord?id=CVE-2016-0703>