---
title: "CVE-2024-4978: Justice AV Solutions (JAVS) Viewer Installer Embedded Malicious Code Vulnerability"
url: https://erroneo.us/security/cve/CVE-2024-4978/
description: "CVE-2024-4978 (Justice AV Solutions Viewer): Exploited in the wild (CISA KEV). Justice AV Solutions Viewer Setup 8.3.7.250-1 contains a malicious binary…"
type: vulnerability-record
section: "Security Digest"
date_published: 2024-05-23
date_modified: 2025-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2024-4978"
kev: true
cvss: 8.7
epss: 0.26937
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2024-4978: Justice AV Solutions (JAVS) Viewer Installer Embedded Malicious Code 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 Justice AV Solutions Viewer. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-05-29, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-06-19 ; treat that as the outer limit, not the target.
- EPSS 26.9% , percentile 98: FIRST’s model estimates a 26.9% chance of exploitation activity in the next 30 days, higher than 98% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Needs an account (high (admin)). Exposure depends on who can log in.

## What it is

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.

## Affected products (CVE record)

- Justice AV Solutions Viewer: 8.3.7.250

## Severity

- cisa-cg CVSS 3.1: 8.4 `CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H`
- cisa-cg CVSS 4.0: 8.7 `CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`

## Exploitation

- CISA KEV: added 2024-05-29; federal due date 2024-06-19. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 26.94% probability of exploitation activity in the next 30 days; percentile 98.

## Sources

- [Listed in CISA KEV notes (rapid7.com)](https://www.rapid7.com/blog/post/2024/05/23/cve-2024-4978-backdoored-justice-av-solutions-viewer-software-used-in-apparent-supply-chain-attack#remediation)
- [Listed in CISA KEV notes (javs.com)](https://www.javs.com/downloads)
- [CVE.org record CVE-2024-4978](https://www.cve.org/CVERecord?id=CVE-2024-4978)
- [NVD entry CVE-2024-4978](https://nvd.nist.gov/vuln/detail/CVE-2024-4978)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-4978)
- [twitter.com](https://twitter.com/2RunJack2/status/1775052981966377148)
- [rapid7.com](https://www.rapid7.com/blog/post/2024/05/23/cve-2024-4978-backdoored-justice-av-solutions-viewer-software-used-in-apparent-supply-chain-attack/)

---
Source page: https://erroneo.us/security/cve/CVE-2024-4978/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt