CVE-2021-36706Public exploitNetwork attack vector

Authenticated root command execution via unsanitized command parameter

Published Aug 6, 2021 · Updated Aug 4, 2024

OS command injection in ProLink PRC2402M firmware 1.0.18 and earlier allows remote authenticated users to execute commands as root. The set_sys_cmd function in adm.cgi routes page=sysCMD requests and passes the command parameter directly to system without validation. Access to the router's authenticated HTTP admin console is required, and successful exploitation grants a root shell with full control of the device.

CVSS severity9.8
Critical
EPSS probability2.62%
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 ProLink PRC2402M firmware 1.0.18 and earlier allows remote authenticated users to execute commands as root. The set_sys_cmd function in adm.cgi routes page=sysCMD requests and passes the command parameter directly to system without validation. Access to the router's authenticated HTTP admin console is required, and successful exploitation grants a root shell with full control of the device.

The record

CVE
CVE-2021-36706
Published
Aug 6, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-78, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 6, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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

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

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 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 exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.004Command and Scripting Interpreter: Unix Shell

Public exploit references

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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