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HIGH · CVSS 8.4 CISA Known Exploited Vulnerability

CVE-2024-4978

Justice AV Solutions (JAVS) Viewer Installer Embedded Malicious Code Vulnerability

Justice AV Solutions 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.

CVSS
8.4
HIGH
EPSS
26.9%
30-day exploitation
Ransomware groups
0
recorded exploiting
Published
23 May 2024
CWE-506

Exploitation status

CISA Known Exploited Vulnerabilities

Listed by CISA on 29 May 2024. US federal agencies were required to remediate it by 19 June 2024.

EPSS — exploitation probability

FIRST puts the probability of exploitation activity in the next 30 days at 26.9%, which is higher than 98% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H

Frequently asked questions

Is CVE-2024-4978 being exploited by ransomware groups?

No ransomware group in this database is currently recorded as exploiting CVE-2024-4978.

What does CVE-2024-4978 affect?

CVE-2024-4978 affects Justice AV Solutions 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.

How severe is CVE-2024-4978?

CVE-2024-4978 is rated HIGH with a CVSS base score of 8.4. EPSS puts the probability of exploitation in the next 30 days at 26.9%, higher than 98% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 19 June 2024.

How should organisations respond to CVE-2024-4978?

Apply the vendor patch for Justice AV Solutions Viewer as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.