---
title: "CVE-2013-1895\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-2013-1895?format=md
keywords: index, follow
---

# CVE-2013-1895

Publication date 28 January 2020

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-2013-1895?format=md#impact-score)

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## Description

The py-bcrypt module before 0.3 for Python does not properly handle
concurrent memory access, which allows attackers to bypass authentication
via multiple authentication requests, which trigger the password hash to be
overwritten.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2013-1895?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| python-bcrypt | 14.04 LTS trusty | Not in release |
| 13.10 saucy | Ignored end of life |
| 13.04 raring | Ignored end of life |
| 12.10 quantal | Ignored end of life |
| 12.04 LTS precise | Not affected |
| 11.10 oneiric | Ignored end of life |
| 10.04 LTS lucid | Not affected |
| 8.04 LTS hardy | Not in release |

---

* [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-2013-1895?format=md#patch-details)

## Notes

---

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

lucid and precise aren't vulnerable as v0.1 did not release the
GIL.

### 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 |
| --- | --- |
| python-bcrypt | * Upstream:   <https://code.google.com/p/py-bcrypt/source/detail?r=3bc365ff43736d26ff37e9f2a4084f37b381b569> |

## 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 | High |
  | Availability impact | None |
* 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:H/A:N

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-1895)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2013-1895)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2013-1895)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2013-1895)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2013-1895>