CVEs / CVE-2024-4978
CVE-2024-4978: Justice AV Solutions (JAVS) Viewer Installer Embedded Malicious Code Vulnerability
- Known exploited in the CISA KEV catalog since 29 May 2024
- high 8.4 CVSS 3.1 (NVD)
- EPSS 26.9% chance of exploitation in the next 30 days, higher than 98% of CVEs (30 Oct 2026)
- Last changed at its sources
Are you affected? Check your servers with Stackurity: it lists the software on each server and the vulnerabilities to fix first.
Check your servers with Stackurity Already using Stackurity? Search for CVE-2024-4978
Summary
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.
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.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| Justice AV Solutions Viewer | 8.3.7.250 | — |
| javs viewer | 8.3.7.250 | — |
Exploitation
| In CISA KEV since | 29 May 2024 |
|---|---|
| Due date for US federal agencies | 19 Jun 2024 |
| Used in ransomware campaigns | Unknown |
| Required action | Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. |
Severity
| CVSS 3.1 | 8.4 highCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:HScored by NVD |
|---|---|
| Weakness | CWE-506 |
References
- CVE-2024-4978 on NVD
- CVE-2024-4978 in the CISA KEV catalog
- 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 (cited by CISA)
- https://www.javs.com/downloads (cited by CISA)
- https://twitter.com/2RunJack2/status/1775052981966377148 Third Party Advisory
- https://www.javs.com/downloads/ Broken Link, Product
- https://www.rapid7.com/blog/post/2024/05/23/cve-2024-4978-backdoored-justice-av-solutions-viewer-software-used-in-apparent-supply-chain-attack/ Exploit, Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-4978 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.