---
title: "CVE-2018-8733\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-2018-8733?format=md
keywords: index, follow
---

# CVE-2018-8733

Publication date 18 April 2018

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**9.8 · Critical**

[Score breakdown](https://ubuntu.com/security/CVE-2018-8733?format=md#impact-score)

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## Description

Authentication bypass vulnerability in the core config manager in Nagios XI
5.2.x through 5.4.x before 5.4.13 allows an unauthenticated attacker to
make configuration changes and leverage an authenticated SQL injection
vulnerability.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2018-8733?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| nagios3 | 17.10 artful | Not affected |
| 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)

## Notes

---

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

No indication that these issues also affect open-source Nagios
3.x.

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

9.8 · Critical

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 9.8 · Critical |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-8733)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2018-8733)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2018-8733)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2018-8733)

### Other references

* <https://assets.nagios.com/downloads/nagiosxi/CHANGES-5.TXT>
* <https://gist.github.com/caleBot/f0a93b5a98574393e0139104eacc2d0f>
* <https://www.nagios.com/downloads/nagios-xi/change-log/>
* <https://www.cve.org/CVERecord?id=CVE-2018-8733>