CVE-2021-40407Network attack vector

OS command injection via unvalidated DDNS domain

Published Jan 28, 2022 · Updated Oct 21, 2025

OS command injection in Reolink RLC-410W v3.0.0.136_20121102 allows attackers to execute operating-system commands through an HTTP request. The SetDdns device network-settings path copies the supplied ddns->domain value without validation before using it in command processing. The request must reach the camera's network-settings interface; successful injection can execute commands with the device service's privileges.

CVSS severity9.1
Critical
EPSS probability47.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Reolink RLC-410W v3.0.0.136_20121102 allows attackers to execute operating-system commands through an HTTP request. The SetDdns device network-settings path copies the supplied ddns->domain value without validation before using it in command processing. The request must reach the camera's network-settings interface; successful injection can execute commands with the device service's privileges.

The record

CVE
CVE-2021-40407
Published
Jan 28, 2022
Updated
Oct 21, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-78, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 28, 2022CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.1Cisco Talos CNACVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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