CVE-2024-3721
Confirmed PUBLISHEDTBK DVR-4104/DVR-4216 os command injection
Not yet in CISA KEV
Recommended Action
Prioritize immediate patching and validate internet-facing exposure. Monitor for matching exploitation attempts in your environment.
At a Glance
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. Eine kritische Schwachstelle wurde in TBK DVR-4104 and DVR-4216 bis 20240412 gefunden. Betroffen davon ist ein unbekannter Prozess der Datei /device.rsp?opt=sys&cmd=___S_O_S_T_R_E_A_MAX___. Mittels dem Manipulieren des Arguments mdb/mdc mit unbekannten Daten kann eine os command injection-Schwachstelle ausgenutzt werden. Die Umsetzung des Angriffs kann dabei über das Netzwerk erfolgen. Der Exploit steht zur öffentlichen Verfügung.
- CVE Published
- Apr 13, 2024
- Exploitation Reported
- Apr 22, 2025
- CVSS
- 6.3 Medium
- EPSS
- 86.5%
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| tbkvision |
tbk-dvr4104
|
0 |
Affected |
| tbkvision |
tbk-dvr4216
|
0 |
Affected |
| TBK |
DVR-4104
|
20240412 |
Affected |
| TBK |
DVR-4216
|
20240412 |
Affected |
CVE References
- Submit #314969 | TBK TBK DVR-4104, TBK DVR-4216 N/A Command Injection vuldb.com · Third-Party Advisory https://vuldb.com/?submit.314969
- GitHub — netsecfish/tbk_dvr_command_injection github.com · Exploit https://github.com/netsecfish/tbk_dvr_command_injection
- VDB-260573 | TBK DVR-4104/DVR-4216 os command injection vuldb.com · Technical Description https://vuldb.com/?id.260573
- VDB-260573 | CTI Indicators (IOB, IOC, TTP, IOA) vuldb.com · Signature https://vuldb.com/?ctiid.260573
Recommended Actions
- Prioritize immediate patching and validate internet-facing exposure. Monitor for matching exploitation attempts in your environment.
- Review sensor telemetry for request paths, attacker IPs, and payload patterns that may inform detection and exposure validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| The Shadowserver First | 2025-04-28 00:00 UTC |
| KEVIntel | 2026-07-14 15:58 UTC |
Operational indicators for this CVE are listed on the Detection tab.
Observed Exploitation Attempts
Exploitation attempts against this vulnerability observed first-hand by KEVIntel private honeypots over the last 30 days.
- Attempts Observed
- 8
- Unique Attacker IPs
- 5
- Attacker Countries
- 🇩🇪 🇳🇱 🇺🇸
- Sensors Observed
- 3
Exploitation Attempts Over the Last 12 Days
First observed (all time) 2026-07-09 15:12 UTC · Last observed 2026-07-14 15:18 UTC
See more exploitation detail
- Pro — sensor software/region breakdown and 24h/7d window summaries.
- Enterprise — raw attacker IPs, request paths, User-Agents, and payloads.
Indicators of Compromise (IoCs)
Attacker IP IoCs observed in KEVIntel sensors are available to Pro and Enterprise accounts on the Detection tab and through the Pro API.
Learn about Pro API accessObserved Detection Signals (30d)
Aggregate counts from KEVIntel sensor telemetry for this CVE.
- Distinct request paths
- 1
- Distinct User-Agents
- 2
The specific request paths and User-Agents attackers are using are available on Pro and Enterprise plans.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
AV:N/AC:L/Au:S/C:P/I:P/A:P
Exploitation Status
Exploited in the wild
Recorded 2025-04-22 00:00:00 UTC · The Shadowserver
Active exploitation observed
Recorded 2026-07-09 15:12:54 UTC · KEVIntel sensor
Weaknesses (CWE)
-
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
15:12 UTC 10 days ago15:12 UTC · 10 days ago
Observed by KEVIntel sensors
Evidence-backed exploitation signal
-
15:12 UTC 10 days ago15:12 UTC · 10 days ago
Indicators of compromise added (5)
Indicators of compromise recorded
-
00:00 UTC about 1 year ago00:00 UTC · about 1 year ago
Added to KEVIntel KEV Feed
High-confidence, third-party attested exploitation
-
12:00 UTC over 2 years ago12:00 UTC · over 2 years ago
CVE published
Vulnerability disclosed publicly
-
17:19 UTC over 2 years ago17:19 UTC · over 2 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2024-3721
{
"cve_id": "CVE-2024-3721",
"title": "TBK DVR-4104/DVR-4216 os command injection",
"affected_vendor": "TBK",
"affected_product": "DVR-4104, DVR-4216",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 6.3,
"epss_score": 0.86489,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": true
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}