What is CVE-2023-43208?

CVE-2023-43208 is a critical-severity vulnerability in Nextgen Mirth Connect, classified under OS Command Injection. CVSS score: 9.8/10. Published 2023-10-26.

How severe is CVE-2023-43208?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2023-43208 known to be exploited?

Yes. CVE-2023-43208 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-05-20), indicating it is being actively exploited. 48 public proof-of-concept repositories are indexed.

RCE in Nextgen Mirth Connect

CVE-2023-43208

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.

Vulnerability class: Command Injection (OS Command Injection)

Published 2023-10-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.827 (99.7th percentile), scored 2026-10-16.

High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.827 · newest: 0.827 · change: 0.000

Affected products

Nextgen Mirth Connect

Weakness classification (CWE)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2024-05-20. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2024-06-10.

Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Known ransomware campaign use: yes.

Public proof-of-concept exploits

References

www.horizon3.ai/nextgen-mirth-connect-remote-code-execution-vulnerability-cve-2… (Exploit, Third Party Advisory)
packetstormsecurity.com/files/176920/Mirth-Connect-4.4.0-Remote-Command-Executi… (Exploit, VDB Entry, Third Party Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2023-43208?: CVE-2023-43208 is a critical-severity vulnerability in Nextgen Mirth Connect, classified under OS Command Injection. CVSS score: 9.8/10. Published 2023-10-26.
How severe is CVE-2023-43208?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2023-43208 known to be exploited?: Yes. CVE-2023-43208 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-05-20), indicating it is being actively exploited. 48 public proof-of-concept repositories are indexed.