CVE-2024-3721

DiscoveredApr 13, 2024UpdatedApr 15, 2026

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.

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CVSS v3.1

6.3 MEDIUM

EPSS

86.5%

probability of exploitation in 30 days

CISA KEV

Not listed

no confirmed exploitation reported

News coverage

sources referencing this CVE

Related IOCs

seen in the same coverage

EPSS Trend

Aug 16, 2026 → Aug 26, 2026

▲ 0.48pp

86.0% → 86.5% over 2 tracked changes

CVSS v3.1 Detail

Attack VectorNETWORK

Attack ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

ScopeUNCHANGED

ConfidentialityLOW

IntegrityLOW

AvailabilityLOW

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

Connections

4 relationships

CWE-78

source

Timeline

disclosure → media coverage

Apr 13, 2024

Disclosure — published as a CVE record. · last revised by NVD Apr 15, 2026

Apr 18, 2026

thehackernews.com reports: Mirai Variant Nexcorium Exploits CVE-2024-3721 to Hijack TBK DVRs for DDoS Botnet

Apr 20, 2026

infosecurity-magazine.com reports: Attackers Exploit DVR Command Injection Flaw to Deploy Mirai-Based Botnet

Oct 5, 2026

thehackernews.com reports: Realtek Jungle SDK Exploit Attempts Deliver Cling Botnet With STUN-Based C2