---
title: "CVE-2016-3954\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-2016-3954?format=md
keywords: index, follow
---

# CVE-2016-3954

Publication date 6 February 2018

Last updated 25 August 2025

---

Ubuntu priority

**Low**

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

## Cvss 3 Severity Score

**5.5 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2016-3954?format=md#impact-score)

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## Description

web2py before 2.14.2 allows remote attackers to obtain the
session\_cookie\_key value via a direct request to
examples/simple\_examples/status. NOTE: this issue can be leveraged by
remote attackers to execute arbitrary code using CVE-2016-3957.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| web2py | 19.04 disco | Not in release |
| 18.10 cosmic | Not in release |
| 18.04 LTS bionic | Not in release |
| 17.10 artful | Ignored end of life |
| 16.04 LTS xenial | Fixed 2.12.3-1ubuntu0.1 |
| 14.04 LTS trusty | 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)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

5.5 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.5 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-3954)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2016-3954)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2016-3954)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2016-3954)

### Related Ubuntu Security Notices (USN)

+ [USN-4030-1](https://usn.ubuntu.com/USN-4030-1)
+ web2py vulnerabilities
+ 21 June 2019

### Other references

* <https://devco.re/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957/>
* <https://www.cve.org/CVERecord?id=CVE-2016-3954>