CVE-2021-43163Network attack vector

Unauthenticated code execution via checkNet command injection

Published May 4, 2022 · Updated Jul 9, 2026

Command injection in Ruijie RG-EW Series Routers running ReyeeOS 1.55.1915 and earlier allows remote attackers to execute arbitrary code. The checkNet function in /usr/lib/lua/luci/modules/noauth.lua handles input from /cgi-bin/luci/api/auth without neutralizing command syntax; the disclosure does not name the parameter or command sink. No authentication or user interaction is required, and successful injection executes attacker-supplied commands on the router.

CVSS severity9.8
Critical
EPSS probability2.06%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Ruijie RG-EW Series Routers running ReyeeOS 1.55.1915 and earlier allows remote attackers to execute arbitrary code. The checkNet function in /usr/lib/lua/luci/modules/noauth.lua handles input from /cgi-bin/luci/api/auth without neutralizing command syntax; the disclosure does not name the parameter or command sink. No authentication or user interaction is required, and successful injection executes attacker-supplied commands on the router.

The record

CVE
CVE-2021-43163
Published
May 4, 2022
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 4, 2022CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('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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