Which products and versions are affected by CVE-2024-4978?

Affected: Javs Viewer versions 8.3.7.250; Viewer versions >= 8.3.7.250. The full list is in the CVE brief.

Is CVE-2024-4978 being exploited in the wild?

It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since May 23, 2024.

Is CVE-2024-4978 in the CISA KEV catalog?

Yes. It was added on May 29, 2024 with a federal remediation due date of Jun 19, 2024.

Is there a public exploit for CVE-2024-4978?

Public exploit code is available.

Is there a fix for CVE-2024-4978?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2024-4978 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2024-4978

HighExploitedPublic exploit

Justice AV Solutions Viewer Setup 8.3.7.250-1 contains a malicious binary when executed and is signed with an unexpected authenticode signature.

Published May 22, 2024 · Updated Oct 24, 2025

Key Facts

Patch immediately

CVE-2024-4978 is a high-severity vulnerability (CVSS 8.7 v4) affecting Javs Viewer, Viewer.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since May 23, 2024. Public exploit code is available.
EPSS estimates a 27% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v4

8.7

CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS (30-day exploit likelihood)

27%

Higher than 98.0% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2024-4978 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

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.

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
CISA KEV	May 29, 2024	Jun 19, 2024	Not reported
Industry KEV feed	May 23, 2024	Jun 19, 2024	Not reported
CIRCL KEV	May 29, 2024	Jun 19, 2024	Not reported
ENISA EUVD	May 29, 2024	n/a	Not reported

Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Affected Products

2 affected entries in total

Product	Affected versions	Fixed in
Javs ViewerJavs	8.3.7.250	n/a
Viewer	>= 8.3.7.250	n/a

Timeline

Publicly disclosed
May 22, 2024
Added to Industry KEV feed
May 23, 2024
Added to CISA KEV
May 29, 2024
Added to CIRCL KEV
May 29, 2024
Added to ENISA EUVD
May 29, 2024
Last updated
Oct 24, 2025

Weakness Type

CWE-506 Embedded Malicious Code

References

1 more references in the full CVE brief

FAQ

Common Questions.

Justice AV Solutions Viewer Setup 8.3.7.250-1 contains a malicious binary when executed and is signed with an unexpected authenticode signature.
Affected: Javs Viewer versions 8.3.7.250; Viewer versions >= 8.3.7.250. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since May 23, 2024.
Yes. It was added on May 29, 2024 with a federal remediation due date of Jun 19, 2024.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2024-4978 Running On Your Attack Surface?

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