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CVE-2024-4978

Justice AV Solutions (JAVS) Viewer Installer Embedded Malicious Code

8.4 HIGHActively exploited (CISA KEV)Public exploitEPSS 26.9%
  1. Published23 May 2024
  2. Added to CISA KEV29 May 2024
  3. Remediation due19 Jun 2024
Actively exploited (CISA KEV)

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 KEV: 29 May 2024Federal remediation due: 19 Jun 2024

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredHigh
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H

Affected products

Javs Viewer8.3.7.250

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2024-4978 being actively exploited?

Yes. CVE-2024-4978 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 29 May 2024.

How severe is CVE-2024-4978?

CVE-2024-4978 has a CVSS 3.1 base score of 8.4, rated high. EPSS estimates a 26.9% probability of exploitation.

Which products are affected by CVE-2024-4978?

Affected products include Javs Viewer.

How do I fix CVE-2024-4978?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2024-4978 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.