Which products and versions are affected by CVE-2024-3721?

Affected: DVR-4104 versions >= 20240412; DVR-4216 versions >= 20240412. The full list is in the CVE brief.

Is CVE-2024-3721 being exploited in the wild?

It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Apr 21, 2024.

Is CVE-2024-3721 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2024-3721?

Public exploit code is available.

Is there a fix for CVE-2024-3721?

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

How urgently should CVE-2024-3721 be patched?

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

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Vulnerability Intelligence

CVE-2024-3721

MediumExploitedPublic exploit

The manipulation of the argument mdb/mdc leads to os command injection.

Published Apr 13, 2024 · Updated Apr 14, 2026

Key Facts

Patch immediately

CVE-2024-3721 is a medium-severity vulnerability (CVSS 6.3 v3.1) affecting DVR-4104, DVR-4216.
It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Apr 21, 2024. Public exploit code is available.
EPSS estimates a 86% 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 v3.1

6.3

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

EPSS (30-day exploit likelihood)

86%

Higher than 99.7% of all scored CVEs

Exploited in the wild

Yes

2 catalog listings

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2024-3721 brief as a PDF

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

Description

A vulnerability was found in TBK DVR-4104 and DVR-4216 up to 20240412 and classified as critical. This issue affects some unknown processing of the file /device.rsp?opt=sys&cmd=_S_O_S_T_R_E_A_MAX_. The manipulation of the argument mdb/mdc leads to os command injection. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The identifier VDB-260573 was assigned to this vulnerability.

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
Industry KEV feed	Apr 21, 2024	n/a	Not reported
CIRCL KEV	Apr 21, 2024	n/a	Not reported

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

Affected Products

2 affected entries in total

Product	Affected versions	Fixed in
DVR-4104	>= 20240412	n/a
DVR-4216	>= 20240412	n/a

Timeline

Publicly disclosed
Apr 13, 2024
Added to Industry KEV feed
Apr 21, 2024
Added to CIRCL KEV
Apr 21, 2024
Last updated
Apr 14, 2026

Weakness Type

CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

References

9 more references in the full CVE brief

FAQ

Common Questions.

A vulnerability was found in TBK DVR-4104 and DVR-4216 up to 20240412 and classified as critical.
Affected: DVR-4104 versions >= 20240412; DVR-4216 versions >= 20240412. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Apr 21, 2024.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
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.

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