CVE-2021-44080Public exploitNetwork attack vector

Root command execution via unsanitized connection_type

Published Jun 1, 2022 · Updated Aug 4, 2024

OS command injection in setup.cgi on SerComm h500s firmware lowi-h500s-v3.4.22 allows remote authenticated users to execute commands as root. During diagnostic tracing, setup.cgi passes the connection_type value to a shell-capable command path without sanitizing special characters, so command substitution reaches the mini_httpd server process. Access requires a privileged device login and valid session and CSRF tokens; successful exploitation grants root-level control of the router.

CVSS severity7.2
High
EPSS probability24.92%
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 setup.cgi on SerComm h500s firmware lowi-h500s-v3.4.22 allows remote authenticated users to execute commands as root. During diagnostic tracing, setup.cgi passes the connection_type value to a shell-capable command path without sanitizing special characters, so command substitution reaches the mini_httpd server process. Access requires a privileged device login and valid session and CSRF tokens; successful exploitation grants root-level control of the router.

The record

CVE
CVE-2021-44080
Published
Jun 1, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-78, T1059.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jun 1, 2022CVE 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 privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
6.6NCC GroupCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
9.0NIST NVDAV:N/AC:L/Au:S/C:C/I:C/A:C

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

Weakness, pattern, technique

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