Threats / NextGen Healthcare / CVE-2023-43208
CVE-2023-43208
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
NextGen Healthcare Mirth Connect vulnerability
NextGen Healthcare Mirth Connect contains a deserialization vulnerability allowing unauthenticated remote code execution via specially crafted requests.
Verdict
Today item, not a backlog item.
Critical unauthenticated remote code execution in widely deployed healthcare integration software. Active exploitation and ransomware deployment confirmed. Immediate patching required.
CISA KEV Yes · 2024-05-203Ransomware use Flagged3EPSS 0.82708 (verify live)4Exploit Weaponized · public PoC5
01
Is it exploitable?
— the evidence, ranked above the scoreExploit available
Fully weaponized — public exploit code is cataloged for this vulnerability.We link the existence of the exploit; we do not host or redistribute payloads.
Reported exploitation
548 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-05-20), flagged for known ransomware use.
Probability (EPSS)
EPSS 0.82708 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: NextGen Healthcare, Mirth Connect. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-502 Deserialization of Untrusted Data — weakness family: Injection.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malicious serialized object and send it to an unauthenticated endpoint on Mirth Connect.
Business
Attacker gains code execution without credentials, bypassing all authentication controls.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I execute arbitrary commands on the server hosting Mirth Connect to establish persistence and lateral movement.
Business
Healthcare operations face system compromise, data exfiltration risk, and network-wide infection vectors.
3
Lateral reach — past segmentation narrative 3
Attacker
I deploy ransomware payloads across connected healthcare infrastructure and data repositories.
Business
Patient care disruption, regulatory breach notification obligations, ransom demands, and recovery costs.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05