---
title: "CVE-2015-1789\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-2015-1789?format=md
keywords: index, follow
---

# CVE-2015-1789

Publication date 11 June 2015

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-2015-1789?format=md#impact-score)

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## Description

The X509\_cmp\_time function in crypto/x509/x509\_vfy.c in OpenSSL before
0.9.8zg, 1.0.0 before 1.0.0s, 1.0.1 before 1.0.1n, and 1.0.2 before 1.0.2b
allows remote attackers to cause a denial of service (out-of-bounds read
and application crash) via a crafted length field in ASN1\_TIME data, as
demonstrated by an attack against a server that supports client
authentication with a custom verification callback.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| openssl | 19.04 disco | Fixed 1.0.2c-1ubuntu1 |
| 18.10 cosmic | Fixed 1.0.2c-1ubuntu1 |
| 18.04 LTS bionic | Fixed 1.0.2c-1ubuntu1 |
| 17.10 artful | Fixed 1.0.2c-1ubuntu1 |
| 17.04 zesty | Fixed 1.0.2c-1ubuntu1 |
| 16.10 yakkety | Fixed 1.0.2c-1ubuntu1 |
| 16.04 LTS xenial | Fixed 1.0.2c-1ubuntu1 |
| 15.10 wily | Fixed 1.0.2c-1ubuntu1 |
| 15.04 vivid | Fixed 1.0.1f-1ubuntu11.4 |
| 14.10 utopic | Fixed 1.0.1f-1ubuntu9.8 |
| 14.04 LTS trusty | Fixed 1.0.1f-1ubuntu2.15 |
| 12.04 LTS precise | Fixed 1.0.1-4ubuntu5.31 |
| 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 |
| 15.10 wily | Not in release |
| 15.04 vivid | Ignored end of life |
| 14.10 utopic | Ignored end of life |
| 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)

## 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:3.0/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-2015-1789)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2015-1789)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2015-1789)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2015-1789)

### Related Ubuntu Security Notices (USN)

+ [USN-2639-1](https://usn.ubuntu.com/USN-2639-1)
+ OpenSSL vulnerabilities
+ 11 June 2015

### Other references

* <https://www.openssl.org/news/secadv_20150611.txt>
* <https://www.cve.org/CVERecord?id=CVE-2015-1789>