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CRITICAL · CVSS 9.8 CISA Known Exploited Vulnerability

CVE-2023-43208

NextGen Healthcare Mirth Connect Deserialization of Untrusted Data Vulnerability

NextGen Healthcare Mirth Connect

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.

CVSS
9.8
CRITICAL
EPSS
85.9%
30-day exploitation
Ransomware groups
0
recorded exploiting
Published
26 Oct 2023
CWE-78, CWE-502

Exploitation status

CISA Known Exploited Vulnerabilities

Listed by CISA on 20 May 2024. US federal agencies were required to remediate it by 10 June 2024. CISA records this vulnerability as known to be used in ransomware campaigns.

EPSS — exploitation probability

FIRST puts the probability of exploitation activity in the next 30 days at 85.9%, which is higher than 99.7% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Frequently asked questions

Is CVE-2023-43208 being exploited by ransomware groups?

No ransomware group in this database is currently recorded as exploiting CVE-2023-43208.

What does CVE-2023-43208 affect?

CVE-2023-43208 affects NextGen Healthcare Mirth Connect. 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.

How severe is CVE-2023-43208?

CVE-2023-43208 is rated CRITICAL with a CVSS base score of 9.8. EPSS puts the probability of exploitation in the next 30 days at 85.9%, higher than 99.7% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 10 June 2024.

How should organisations respond to CVE-2023-43208?

Apply the vendor patch for NextGen Healthcare Mirth Connect as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.