CVE-2023-6740

Root code execution via replaceable jarsigner binary

Published Jan 12, 2024 · Updated Jun 3, 2025

Privilege escalation in Checkmk's jar_signature plug-in allows local users to execute code as root through a substituted jarsigner binary. The plug-in ran jarsigner from a JAVA_HOME location writable by the oracle user while retaining root privileges instead of dropping to that user's identity. Affected releases include 2.2.0 before 2.2.0p18, 2.1.0 before 2.1.0p38, and 2.0.0p39 and earlier; exploitation requires local oracle-user access and plug-in deployment.

CVSS severity8.8
High
EPSS probability0.18%
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 Checkmk's jar_signature plug-in allows local users to execute code as root through a substituted jarsigner binary. The plug-in ran jarsigner from a JAVA_HOME location writable by the oracle user while retaining root privileges instead of dropping to that user's identity. Affected releases include 2.2.0 before 2.2.0p18, 2.1.0 before 2.1.0p38, and 2.0.0p39 and earlier; exploitation requires local oracle-user access and plug-in deployment.

The record

CVE
CVE-2023-6740
Published
Jan 12, 2024
Updated
Jun 3, 2025
Vendor
Checkmk GmbH
Product
Checkmk
Classifications
CWE-269, CWE-427, T1574.007
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 3, 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=2.0.0 <=2.0.0p39
  2. Affected versionversion=2.1.0 <2.1.0p38
  3. Affected versionversion=2.2.0 <2.2.0p18

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Checkmk GmbH · Checkmkversion=2.0.0 <=2.0.0p39; version=2.1.0 <2.1.0p38; version=2.2.0 <2.2.0p18

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8Checkmk GmbHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A: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-269Improper Privilege Management
CWE-427Uncontrolled Search Path Element
T1574.007PATH Environment Variable Hijacking

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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