CVE-2023-43208 — NextGen Healthcare Mirth Connect Deserialization of Untrusted Data Vulnerability

NextGen Healthcare Mirth Connect before version 4.4.1 is vulnerable to unauthenticated remote code execution. Note that this vulnerability is caused by the incomplete patch of CVE-2023-37679.

01What is this vulnerability?

NextGen Healthcare Mirth Connect before version 4.4.1 is vulnerable to unauthenticated remote code execution. Note that this vulnerability is caused by the incomplete patch of CVE-2023-37679.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2024-05-20. Ransomware use: Known.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

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07Related CVEs

08Timeline

• Published: 2023-10-26T00:00:00.000Z
• Last modified: 2025-10-21T23:05:33.594Z
• Added to CISA KEV: 2024-05-20
• BOD 22-01 due: 2024-06-10

09References

• www.horizon3.ai — https://www.horizon3.ai/nextgen-mirth-connect-remote-code-execution-vulnerabilit…
• packetstormsecurity.com — http://packetstormsecurity.com/files/176920/Mirth-Connect-4.4.0-Remote-Command-E…