# CVE-2024-4978: Justice AV Solutions (JAVS) Viewer Installer Embedded Malicious Code Vulnerability

Source: https://junglewise.ai/threats/cve-2024-4978-justice-av-solutions-javs-viewer-installer-embedded-malicious-code  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2024-05-29. Updated: 2026-05-09  
License: CC BY 4.0 with a link back

CVE-2024-4978 · Severity: critical · CVSS 8.4 · Exploited in the wild · Published 2024-05-29

Justice AV Solutions (JAVS) Viewer installer version 8.3.7.250-1 contains a malicious version of ffmpeg.exe (named fffmpeg.exe) that functions as a backdoor. When executed, the binary establishes a connection to a malicious command-and-control (C2) server, allowing for unauthorized PowerShell command execution.

## Quick answers

**Is CVE-2024-4978 exploited in the wild?** Yes. CVE-2024-4978 is known to be exploited in the wild, first recorded on 29 May 2024. Treat it as urgent.

**How severe is CVE-2024-4978?** Critical severity, with a CVSS score of 8.4, published 29 May 2024.

**Which products and versions are affected?** Justice AV Solutions (JAVS) Viewer Setup 8.3.7.250-1.

**Is there a fix for CVE-2024-4978?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2024-4978 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2024-4978?** Check whether you run Justice Av Solutions Viewer or Justice Av Solutions Viewer. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Justice AV Solutions (JAVS) Viewer Setup 8.3.7.250-1

## Timeline

- 2024-05-23: disclosed: Rapid7 published a blog post regarding the backdoored software.
- 2024-05-29: kev added: Added to CISA's Known Exploited Vulnerabilities (KEV) Catalog.
- 2024-05-29: exploited: Reported as exploited in the wild.