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Vulnerability record · CVE-2018-6535 · published 27 February 2018

CVE-2018-6535: Icinga vulnerability

Icinga · Icinga

An issue was discovered in Icinga 2.x through 2.8.1. The lack of a constant-time password comparison function can disclose the password to an attacker.

8.1 CVSS 3.0 High EPSS 1.3% · top 30.1%
8.1CVSS 3.0 base score, v2 4.3
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in Icinga 2.x through 2.8.1. The lack of a constant-time password comparison function can disclose the password to an attacker.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/Icinga/icinga2/issues/4920 Third Party Advisory
https://github.com/Icinga/icinga2/pull/5715 Third Party Advisory
https://github.com/Icinga/icinga2/issues/4920 Third Party Advisory
https://github.com/Icinga/icinga2/pull/5715 Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2024-49369Icinga improper certificate validation vulnerabilityIcinga is a monitoring system which checks the availability of network resources, notifies users of outages, and generates performance data for repor…EPSS 2.9%9.3CVE-2025-48057Icinga vulnerabilityIcinga 2 is a monitoring system which checks the availability of network resources, notifies users of outages, and generates performance data for rep…EPSS 0.44%9.1CVE-2020-29663Icinga improper certificate validation vulnerabilityIcinga 2 v2.8.0 through v2.11.7 and v2.12.2 has an issue where revoked certificates due for renewal will automatically be renewed, ignoring the CRL. …EPSS 1.6%8.8CVE-2021-32743Icinga vulnerabilityIcinga is a monitoring system which checks the availability of network resources, notifies users of outages, and generates performance data for repor…EPSS 1.8%8.8CVE-2021-32739Icinga improper privilege management vulnerabilityIcinga is a monitoring system which checks the availability of network resources, notifies users of outages, and generates performance data for repor…EPSS 1.1%8.3CVE-2024-24820Icinga cross-site request forgery vulnerabilityIcinga Director is a tool designed to make Icinga 2 configuration handling easy. Not any of Icinga Director's configuration forms used to manipulate …EPSS 0.40%7.8CVE-2020-14004Icinga link following vulnerabilityAn issue was discovered in Icinga2 before v2.12.0-rc1. The prepare-dirs script (run as part of the icinga2 systemd service) executes chmod 2750 /run/…EPSS 0.74%7.8CVE-2018-6533Icinga vulnerabilityAn issue was discovered in Icinga 2.x through 2.8.1. By editing the init.conf file, Icinga 2 can be run as root. Following this the program can be us…EPSS 0.39%

Source: NIST National Vulnerability Database (record CVE-2018-6535), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.