CVE-2021-42071

CRITICAL EXPLOITED IN THE WILD NUCLEI

Visual Tools DVR VX16 4.2.28.0 - Unauthenticated Remote Command Execution via User-Agent Header

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2021-42071 has been observed exploited in the wild (reported by VulnCheck KEV, InTheWild.io). EIP tracks 1 public exploit from researchers including Andrea D\'Ubaldo. A Nuclei detection template is also available.

AI-analyzed exploit summary This exploit demonstrates an unauthenticated OS command injection vulnerability in Visual Tools DVR VX16 4.2.28.0. It leverages a malformed User-Agent header to inject arbitrary commands, resulting in remote code execution.

Description

In Visual Tools DVR VX16 4.2.28.0, an unauthenticated attacker can achieve remote command execution via shell metacharacters in the cgi-bin/slogin/login.py User-Agent HTTP header.

Exploits (1)

exploitdb WORKING POC
by Andrea D\'Ubaldo · textwebappsmultiple
https://www.exploit-db.com/exploits/50098

This exploit demonstrates an unauthenticated OS command injection vulnerability in Visual Tools DVR VX16 4.2.28.0. It leverages a malformed User-Agent header to inject arbitrary commands, resulting in remote code execution.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Trivial
Reliability
Reliable
Target: Visual Tools DVR VX16 v4.2.28.0
No auth needed
Prerequisites: Network access to the target device · Target device running vulnerable software
devstral-2 · analyzed Feb 16, 2026 Full analysis →

Nuclei Templates (1)

Visual Tools DVR VX16 4.2.28.0 - Unauthenticated OS Command Injection
CRITICALby gy741

References (3)

Core 3
Core References
Exploit, Third Party Advisory, VDB Entry x_refsource_misc
https://www.exploit-db.com/exploits/50098
Vendor Advisory x_refsource_misc
https://visual-tools.com/

Scores

CVSS v3 9.8
EPSS 0.6988
EPSS Percentile 99.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

VulnCheck KEV 2024-03-06
InTheWild.io 2021-09-30
CWE
CWE-78
Status published
Products (1)
visual-tools/dvr_vx16_firmware 4.2.28.0
Published Oct 07, 2021
Tracked Since Feb 18, 2026