CVE-2021-40410Network attack vector

Authenticated command execution via unvalidated DNS address

Published Jan 28, 2022 · Updated Apr 15, 2025

OS command injection in Reolink RLC-410W 3.0.0.136_20121102 allows remote authenticated users to execute arbitrary commands via HTTP. The bc_dns_set function inserts the SetLocalLink dns1 value into an echo command for /etc/resolv.conf and passes the resulting string to pip_system without validation. The privileged network-settings API and high privileges are required; successful exploitation runs attacker-supplied commands on the camera.

CVSS severity9.1
Critical
EPSS probability27.88%
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 3.0.0.136_20121102 allows remote authenticated users to execute arbitrary commands via HTTP. The bc_dns_set function inserts the SetLocalLink dns1 value into an echo command for /etc/resolv.conf and passes the resulting string to pip_system without validation. The privileged network-settings API and high privileges are required; successful exploitation runs attacker-supplied commands on the camera.

The record

CVE
CVE-2021-40410
Published
Jan 28, 2022
Updated
Apr 15, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-78, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 28, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 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 TalosCVSS: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')
T1059.004Unix Shell

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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