SSRF in agent-receiver API

published 2023-02-20 3 y ago modified 2026-06-17 4 mo ago also EUVD-2022-51021

cvss: 6.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 20%
public exploits: 0; none known

Limited Server-Side Request Forgery (SSRF) in agent-receiver in Tribe29's Checkmk <= 2.1.0p11 allows an attacker to communicate with local network restricted endpoints by use of the host registration API.

Exploit prediction

0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

sonarsource.com https://www.sonarsource.com/blog/checkmk-rce-chain-1/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.8	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
NVD	3.1	3.3	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected products

Tribe29 Checkmk

Classification

Weakness

CWE-20 Improper Input Validation
CWE-918 Server-Side Request Forgery

References

sonarsource.com /blog/checkmk-rce-chain-1/
exploit, third-party-advisory
checkmk.com /werk/14385
mitigation, vendor-advisory

Sources

CVE List CVE-2022-48321
NVD CVE-2022-48321

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary