CVE-2023-1768Network attack vector

Agent data disclosure via silent encryption failure

Published Apr 4, 2023 · Updated Feb 11, 2025

Inappropriate error handling in affected Checkmk 1.6.0 through 2.2.0b3 releases allows remote attackers to read Linux agent data in plaintext. When symmetric encryption and Run agent as non-root user are configured together, the Linux agent silently continues after encryption fails and sends its monitoring output unencrypted. Exposure requires that incompatible configuration and a position able to observe the agent-server traffic; the flaw discloses agent output but does not alter monitoring data or service availability.

CVSS severity3.7
Low
EPSS probability0.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Inappropriate error handling in affected Checkmk 1.6.0 through 2.2.0b3 releases allows remote attackers to read Linux agent data in plaintext. When symmetric encryption and Run agent as non-root user are configured together, the Linux agent silently continues after encryption fails and sends its monitoring output unencrypted. Exposure requires that incompatible configuration and a position able to observe the agent-server traffic; the flaw discloses agent output but does not alter monitoring data or service availability.

The record

CVE
CVE-2023-1768
Published
Apr 4, 2023
Updated
Feb 11, 2025
Vendor
Checkmk GmbH
Product
Checkmk
Classifications
CWE-446, CAPEC-651, T1040
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 4, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 11, 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=1.6.0 <=1.6.0p30
  2. Affected versionversion=2.0.0 <=2.0.0p34
  3. Affected versionversion=2.1.0 <=2.1.0p25
  4. Affected versionversion=2.2.0 <=2.2.0b3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Checkmk GmbH · Checkmkversion=1.6.0 <=1.6.0p30; version=2.0.0 <=2.0.0p34; version=2.1.0 <=2.1.0p25; version=2.2.0 <=2.2.0b3

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
3.7Checkmk GmbHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-446UI Discrepancy for Security Feature
CAPEC-651Eavesdropping
T1040Network Sniffing

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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