CVE-2024-4978
Actively exploited. CVE-2024-4978 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-05-29) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
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.
CSIRTS triage
- What
- The JAVS Viewer installer contains a malicious version of ffmpeg.exe that creates a backdoor connection to a malicious C2 server.
- Who is affected
- Users of the JAVS Viewer installer are affected by this vulnerability.
- Urgency
- Immediate action is required as the vulnerability is actively exploited and classified as critical.
- Action
- Remove the affected installer and replace it with a clean version.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 98% of all EPSS-scored CVEs.
Advisory coverage (1)
- criticalexploitedCVE-2024-4978: Justice AV Solutions (JAVS) Viewer Installer Embedded Malicious Code Vulnerabilitycisa-kev · 2024-05-29
External references
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[](https://www.csirts.com/cve/CVE-2024-4978)