ClosedPatched

Justice AV Solutions (JAVS) Viewer Installer Embedded Malicious Code

Justice AV Solutions Viewer

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. Added to the CISA KEV catalog on 2024-05-29.

Why this severity: CVSS 8.4 (v3.1, CNA), actively exploited (CISA KEV)

Started: May 23, 2024
Closed: May 29, 2024
CVE: CVE-2024-4978

Follow this incident

Updated May 29, 2024

Affected

See vendor advisory (versions are not listed in the KEV record)

Fixed in

See vendor advisory linked in sources

Timeline2

May 29, 2024
CISA added CVE-2024-4978 to the KEV catalog (federal deadline 2024-06-19)
Source
May 23, 2024
CVE-2024-4978 published
Source

Advisories4

Notes & caveats

Derived from the CISA KEV JSON feed (catalogVersion 2026.10.21); CVSS from the CVE record (cveawg.mitre.org). startedAt is the CVE publication date when it fell in 2024 before the KEV listing, else the KEV dateAdded; exploitation may have begun earlier. closedAt is the KEV listing date (a fix or mitigation was available then unless noted).

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