CVE-2022-48321Known exploitationPublic exploitNetwork attack vector

Authenticated SSRF via unencoded host name

Published Feb 20, 2023 · Updated Aug 3, 2024

SSRF in Checkmk 2.1.0 through 2.1.0p11 allows remote authenticated users to make the server send GET requests to local endpoints. The agent-receiver's /register_with_hostname handler passes the unencoded host_name value into host_configuration, which appends it to an internal REST API URL. Host-registration privileges and access to TCP port 8000 are required; exploitation is blind but can reach localhost-only HTTP endpoints.

CVSS severity5.0
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Checkmk 2.1.0 through 2.1.0p11 allows remote authenticated users to make the server send GET requests to local endpoints. The agent-receiver's /register_with_hostname handler passes the unencoded host_name value into host_configuration, which appends it to an internal REST API URL. Host-registration privileges and access to TCP port 8000 are required; exploitation is blind but can reach localhost-only HTTP endpoints.

The record

CVE
CVE-2022-48321
Published
Feb 20, 2023
Updated
Aug 3, 2024
Vendor
Checkmk GmbH
Product
Checkmk
Classifications
CWE-20, CWE-918, T1090
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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=2.1.0 <=2.1.0p11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Checkmk GmbH · Checkmkversion=2.1.0 <=2.1.0p11

Published CVSS scores

6.8Checkmk GmbH CVE recordCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
3.3NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
5.0Checkmk GmbH Werk #14385CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-918Server-Side Request Forgery (SSRF)
T1090Proxy

Public exploit references

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

Reported exploitation

Technologies

Your stack

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Your stack

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