Overview
Justice AV Solutions (JAVS) Viewer installer contains a malicious version of ffmpeg.exe, named fffmpeg.exe (SHA256: 421a4ad2615941b177b6ec4ab5e239c14e62af2ab07c6df1741e2a62223223c4). When run, this creates a backdoor connection to a malicious C2 server.
Please follow the vendor’s instructions as outlined in the public statements at 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 and https://www.javs.com/downloads; https://nvd.nist.gov/vuln/detail/CVE-2024-4978
Key Details
| Property | Value |
|---|---|
| CVE ID | CVE-2024-4978 |
| Vendor / Product | Justice AV Solutions — Viewer |
| NVD Published | 2024-05-23 |
| NVD Last Modified | 2025-10-24 |
| CVSS 3.1 Score | 8.4 |
| CVSS 3.1 Vector | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H |
| Severity | HIGH |
| CWE | CWE-506 |
| CISA KEV Added | 2024-05-29 |
| CISA KEV Deadline | 2024-06-19 |
| Known Ransomware Use | No |
CVSS 3.1 Breakdown
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Required Action
CISA BOD 22-01 Deadline: 2024-06-19.
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Timeline
| Date | Event |
|---|---|
| 2024-05-29 | Added to CISA Known Exploited Vulnerabilities catalog |
| 2024-06-19 | CISA BOD 22-01 remediation deadline |
References
| Resource | Type |
|---|---|
| NVD — CVE-2024-4978 | Vulnerability Database |
| CISA KEV Catalog Entry | US Government |