---
id: CVE-2023-24035
title: An issue was discovered in Nagios XI before 5.9.3
summary: >-
  An issue was discovered in Nagios XI before 5.9.3. The
  is_insecure_login_authenticated function uses a insecure timing comparison
  that leads to an attacker being able to bruteforce the admin password, by
  measuring timing differences in t…
severity: low
cvss: 3.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N'
cwe:
  - CWE-208
vendor: Nagios
product: Nagios XI
affected:
  - xi < 5.9.3
published: '2026-09-14'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T19:56:19.073'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-24035'
references:
  - url: 'https://www.nagios.com/downloads/nagios-xi/change-log/'
    label: cve@mitre.org
  - url: 'https://www.nagios.com/security-disclosures/'
    label: cve@mitre.org
tags:
  - nvd
  - cve.org
epss: 0.00767
epssPercentile: 0.54078
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-16T14:30:06.327638Z'
ingestedAt: '2026-09-14T15:23:07.466Z'
---

## Overview

An issue was discovered in Nagios XI before 5.9.3. The is_insecure_login_authenticated function uses a insecure timing comparison that leads to an attacker being able to bruteforce the admin password, by measuring timing differences in the comparison.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.