CVE-2025-61909

Root process interruption via writable PID file

Published Oct 16, 2025 · Updated Oct 16, 2025

Privilege escalation in affected Icinga 2 releases allows local users controlling the daemon account to signal arbitrary root processes. The safe-reload script and logrotate postrotate hook read a daemon-writable PID file, then invoke kill as root with that untrusted process ID. Access to the Icinga service account and execution of a reload or log rotation are required; impact is limited to SIGHUP or SIGUSR1 delivery.

CVSS severity4.0
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in affected Icinga 2 releases allows local users controlling the daemon account to signal arbitrary root processes. The safe-reload script and logrotate postrotate hook read a daemon-writable PID file, then invoke kill as root with that untrusted process ID. Access to the Icinga service account and execution of a reload or log rotation are required; impact is limited to SIGHUP or SIGUSR1 delivery.

The record

CVE
CVE-2025-61909
Published
Oct 16, 2025
Updated
Oct 16, 2025
Vendor
Icinga
Product
Icinga 2
Classifications
CWE-250, T1489
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 16, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>=2.10.0, < 2.13.13
  2. Affected versionversion=>=2.14.0, < 2.14.7
  3. Affected versionversion=>=2.15.0, < 2.15.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Icinga · Icinga 2version=>=2.10.0, < 2.13.13; version=>=2.14.0, < 2.14.7; version=>=2.15.0, < 2.15.1

Published CVSS scores

4.4UbuntuCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
4.0GitHub, Inc.CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-250Execution with Unnecessary Privileges
T1489Service Stop

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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