---
title: "CVE-2023-43208: NextGen Healthcare Mirth Connect Deserialization of Untrusted Data Vulnerability"
url: https://erroneo.us/security/cve/CVE-2023-43208/
description: "CVE-2023-43208 (NextGen Healthcare Mirth Connect): Exploited in the wild (CISA KEV). NextGen Healthcare Mirth Connect before version 4.4.1 is vulnerable to…"
type: vulnerability-record
section: "Security Digest"
date_published: 2023-10-26
date_modified: 2025-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2023-43208"
kev: true
cvss: 9.8
epss: 0.82708
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run NextGen Healthcare Mirth Connect. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-05-20, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-06-10 ; treat that as the outer limit, not the target. CISA also lists it as known to be used in ransomware campaigns .
- EPSS 82.7% , percentile 99.7: FIRST’s model estimates a 82.7% chance of exploitation activity in the next 30 days, higher than 99.7% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

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.

## Affected products (CVE record)

- n/a n/a: see advisory

## Severity

- CISA-ADP CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2024-05-20; federal due date 2024-06-10. Known ransomware use: Known.
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 82.71% probability of exploitation activity in the next 30 days; percentile 99.7.

## Sources

- [Listed in CISA KEV notes (github.com)](https://github.com/nextgenhealthcare/connect/wiki/4.4.1---What%27s-New)
- [CVE.org record CVE-2023-43208](https://www.cve.org/CVERecord?id=CVE-2023-43208)
- [NVD entry CVE-2023-43208](https://nvd.nist.gov/vuln/detail/CVE-2023-43208)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-43208)
- [horizon3.ai](https://www.horizon3.ai/nextgen-mirth-connect-remote-code-execution-vulnerability-cve-2023-43208/)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/176920/Mirth-Connect-4.4.0-Remote-Command-Execution.html)

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Source page: https://erroneo.us/security/cve/CVE-2023-43208/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt