CVE-2021-44132Public exploitNetwork attack vector

Authenticated command execution via uploaded shell script

Published Feb 25, 2022 · Updated Aug 4, 2024

OS command injection in C-DATA ONU4FERW 2.1.13_X139 and earlier allows remote authenticated users to execute arbitrary commands via a crafted file. The formImportOMCIShell handler writes the uploaded body to /tmp/omcishell and passes that file directly to /bin/sh without validating its contents. Access requires the device's e8c or adminisp debugging account, and successful exploitation runs attacker-supplied shell commands on the ONU.

CVSS severity7.8
High
EPSS probability3.05%
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 C-DATA ONU4FERW 2.1.13_X139 and earlier allows remote authenticated users to execute arbitrary commands via a crafted file. The formImportOMCIShell handler writes the uploaded body to /tmp/omcishell and passes that file directly to /bin/sh without validating its contents. Access requires the device's e8c or adminisp debugging account, and successful exploitation runs attacker-supplied shell commands on the ONU.

The record

CVE
CVE-2021-44132
Published
Feb 25, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 25, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NVDAV:N/AC:M/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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