CVE-2024-4978: Justice AV Solutions (JAVS) Viewer Installer Embedded Malicious Code Vulnerability

Patch now

HIGH 8.4EXPLOITEDDOWNGRADE

CVE-2024-4978 is a high-severity flaw (CVSS 8.4) affecting javs viewer, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
EPSS top 2%: very likely to be exploited
Exploited in the wild (CISA KEV)
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.4 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	26.9% (top 2%)
CISA exploited list	Yes, fix due 2024-06-19
Weakness	CWE-506
Published	2024-05-23
Last modified	2026-06-17

Publisher (CNA): Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government · Vendor: javs

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-05-23 02:15 UTCPublished CVE record published
2024-05-29Exploited Added to the CISA Known Exploited Vulnerabilities list
2024-06-19Deadline CISA due date for US federal agencies to patch
2026-06-17 08:03 UTCUpdated Record last modified

javs javs viewer DOWNGRADE

Affected: 8.3.7.250

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.3.7.250

1. Check installed version

apt-cache policy javs-viewer || rpm -q javs-viewer || javs-viewer --version

2. No fixed release: DOWNGRADE to a release before 8.3.7.250 (Debian / Ubuntu)

apt-cache madison javs-viewer sudo apt install javs-viewer=<VERSION_BEFORE_8.3.7.250> sudo apt-mark hold javs-viewer

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list javs-viewer sudo dnf downgrade javs-viewer-<VERSION_BEFORE_8.3.7.250> sudo dnf versionlock add javs-viewer

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora ELN · efifs · FIXED · 1.13-1.eln159 · FEDORA-2026-3fd0bb7307 · source

sudo dnf upgrade --advisory=FEDORA-2026-3fd0bb7307

Fedora 46 · efifs · FIXED · 1.13-1.fc46 · FEDORA-2026-27ec2fc8fc · source

sudo dnf upgrade --advisory=FEDORA-2026-27ec2fc8fc

Verify at the official source NVD · CVE Program · CISA KEV catalog · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-4978?

javs viewer: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-4978 being exploited?

Yes. CVE-2024-4978 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

What does CVE-2024-4978 affect?

CVE-2024-4978 affects javs viewer. Severity is high (CVSS 8.4). 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 Pow

How urgent is CVE-2024-4978?

Priority 84/100. High severity; EPSS top 2%: very likely to be exploited; Exploited in the wild (CISA KEV); Public exploit reference

Software pages

PowerShell vulnerabilities

References

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