---
title: "CVE-2018-18820\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-2018-18820?format=md
keywords: index, follow
---

# CVE-2018-18820

Publication date 5 November 2018

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**8.1 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2018-18820?format=md#impact-score)

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## Description

A buffer overflow was discovered in the URL-authentication backend of the
Icecast before 2.4.4. If the backend is enabled, then any malicious HTTP
client can send a request for that specific resource including a crafted
header, leading to denial of service and potentially remote code execution.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| icecast2 | 20.04 LTS focal | Not affected |
| 19.10 eoan | Not affected |
| 19.04 disco | Not affected |
| 18.10 cosmic | Ignored end of life |
| 18.04 LTS bionic | Fixed 2.4.3-2ubuntu0.1 |
| 16.04 LTS xenial | Fixed 2.4.2-1ubuntu0.1 |
| 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**

8.1 · High

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 8.1 · High |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-18820)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2018-18820)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2018-18820)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2018-18820)

### Other references

* <https://www.openwall.com/lists/oss-security/2018/11/01/3>
* <https://gitlab.xiph.org/xiph/icecast-server/issues/2342>
* <https://lgtm.com/blog/icecast_snprintf_CVE-2018-18820>
* <https://www.cve.org/CVERecord?id=CVE-2018-18820>