---
title: "CVE-2018-12122\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-2018-12122?format=md
keywords: index, follow
---

# CVE-2018-12122

Publication date 28 November 2018

Last updated 26 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-2018-12122?format=md#impact-score)

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## Description

Node.js: All versions prior to Node.js 6.15.0, 8.14.0, 10.14.0 and 11.3.0:
Slowloris HTTP Denial of Service: An attacker can cause a Denial of Service
(DoS) by sending headers very slowly keeping HTTP or HTTPS connections and
associated resources alive for a long period of time.

### From the Ubuntu Security Team

Jan Maybach discovered that Nde.js did not time out if incomplete HTTP/HTTPS
headers were received. An attacker could use this vulnerability to cause a
denial of service by keeping HTTP/HTTPS connections alive for a long period of
time.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| nodejs | 26.04 LTS resolute | Not affected |
| 25.10 questing | Not affected |
| 25.04 plucky | Not affected |
| 24.10 oracular | Not affected |
| 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 | Ignored end of life |
| 18.04 LTS bionic | Fixed 8.10.0~dfsg-2ubuntu0.4+esm1  Ubuntu Pro |
| 16.04 LTS xenial | Vulnerable |
| 14.04 LTS trusty | Vulnerable |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

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## 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:3.1/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-2018-12122)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2018-12122)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2018-12122)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2018-12122)

### Related Ubuntu Security Notices (USN)

+ [USN-4796-1](https://usn.ubuntu.com/USN-4796-1)
+ Node.js vulnerabilities
+ 15 March 2021

### Other references

* <https://nodejs.org/en/blog/vulnerability/november-2018-security-releases/>
* <https://www.cve.org/CVERecord?id=CVE-2018-12122>