---
title: "CVE-2017-18343\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-2017-18343?format=md
keywords: index, follow
---

# CVE-2017-18343

Publication date 20 July 2018

Last updated 4 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**6.1 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2017-18343?format=md#impact-score)

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## Description

The debug handler in Symfony before v2.7.33, 2.8.x before v2.8.26, 3.x
before v3.2.13, and 3.3.x before v3.3.6 has XSS via an array key during
exception pretty printing in ExceptionHandler.php, as demonstrated by a
/\_debugbar/open?op=get URI. NOTE: the vendor's position is that this is not
a vulnerability because the debug tools are not intended for production
use. NOTE: the Symfony Debug component is used by Laravel Debugbar

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| symfony | 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 | Ignored end of life |
| 16.04 LTS xenial | Not affected |
| 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**

6.1 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.1 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-18343)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2017-18343)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2017-18343)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2017-18343)

### Other references

* <https://github.com/barryvdh/laravel-debugbar/issues/850>
* <https://github.com/symfony/debug/pull/7/commits/e48bda29143bd1a83001780b4a78e483822d985c>
* <https://github.com/symfony/symfony/issues/27987>
* <https://github.com/symfony/symfony/pull/23684>
* <https://www.cve.org/CVERecord?id=CVE-2017-18343>