CVE-2024-4978: Justice AV Solutions (JAVS) Viewer Installer Embedded Malicious Code Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 29 May 2024, 6 days after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 26.9%
EPSS score, percentile 98 of all scored records
- How severe?
- 8.7 High
CVSS v4.0 base score, given by the CNA
- What should I do?
CISA deadline 19 Jun 2024. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
The CVE record links no vendor advisory, patch or mitigation.
- Which versions are affected?
Affected
- 8.3.7.250
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
What to do
Required action, set by CISA
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA due date for this action: 19 June 2024.
Advisories and patches
The CVE record links no vendor advisory, patch or mitigation.
Linked from CISA's catalog entry
- 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
- https://www.javs.com/downloads
- https://nvd.nist.gov/vuln/detail/CVE-2024-4978
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | 8.3.7.250 |
Versions not listed are: unaffected.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
About this vulnerability
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.
Summary: CISA's KEV catalog, as of 28 Oct 2026.
- CISA added CVE-2024-4978 to its Known Exploited Vulnerabilities (KEV) catalog on 29 May 2024.
- CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
- The due date CISA sets for the required action is 19 Jun 2024.
- The CVE record was published on 23 May 2024, 6 days before it was added to KEV.
- The CVE record carries a CVSS v4.0 base score of 8.7 (High), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 26.9% (percentile 98), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact total.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.
Description
Malicious Code in Justice AV Solutions (JAVS) Viewer
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.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
Weakness
- CWE-506: Embedded Malicious Code
Attack patterns (CAPEC)
- CAPEC-122: Privilege Abuse
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| 23 May 2024 | CVE record published |
| 29 May 2024 | Added to CISA KEV |
| 19 Jun 2024 | CISA due date for the required action |
| 21 Oct 2025 | CVE record last updated |