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Exploited vulnerability · CISA KEV

Is CVE-2024-4978 exploited? Yes: in CISA KEV since 29 May 2024

Gociux · Justice AV Solutions Viewer · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2024-4978, Justice AV Solutions (JAVS) Viewer Installer Embedded Malicious Code Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 29 May 2024, 6 days after it was published. It affects Justice AV Solutions Viewer. If you run it, CISA's required action is: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 29 May 2024
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity8.4CVSS 3.1 · high
US federal due19 Jun 2024BOD 22-01 deadline

What it is

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.

VendorJustice AV Solutions (1 exploited CVE in KEV)
ProductViewer
VulnerabilityJustice AV Solutions (JAVS) Viewer Installer Embedded Malicious Code Vulnerability
WeaknessCWE-506
Published23 May 2024
Added to KEV29 May 2024
Reported by (CNA)cisa-cg

What to do

  1. Check whether you run it. Look for Viewer in your asset inventory, including appliances and cloud images. Stack check lists every exploited Justice AV Solutions CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 23 May 2024.
  4. Get told next time. Email alerts when CISA adds a CVE for Justice AV Solutions.

References

Questions

Is CVE-2024-4978 being exploited?

Yes. CISA added CVE-2024-4978 to the Known Exploited Vulnerabilities catalog on 29 May 2024, which means there is reliable evidence of exploitation in the wild.

Is CVE-2024-4978 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2024-4978?

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Check Justice AV Solutions's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Viewer and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in May 2024 · act-now radar.

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