CVE-2022-36553Known exploitationPublic exploitNetwork attack vector

Unauthenticated command execution via popen.cgi parameter

Published Aug 29, 2022 · Updated Aug 3, 2024

Command injection in Hytec Inter HWL-2511-SS 1.05 and earlier allows remote attackers to execute arbitrary commands via popen.cgi. The /www/cgi-bin/popen.cgi endpoint passes the command query parameter to a system shell without neutralizing shell metacharacters. An unauthenticated HTTPS request is sufficient; the public proof of concept uses the flaw to open a reverse shell on the router.

CVSS severity9.8
Critical
EPSS probability90.90%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Hytec Inter HWL-2511-SS 1.05 and earlier allows remote attackers to execute arbitrary commands via popen.cgi. The /www/cgi-bin/popen.cgi endpoint passes the command query parameter to a system shell without neutralizing shell metacharacters. An unauthenticated HTTPS request is sufficient; the public proof of concept uses the flaw to open a reverse shell on the router.

The record

CVE
CVE-2022-36553
Published
Aug 29, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, T1190, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 29, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 privilegesunauthenticated

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

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
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1190Exploit Public-Facing Application
T1059.004Unix Shell

Public exploit references

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

Reported exploitation

Technologies

Your stack

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Your stack

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