CVE-2021-27201Public exploitNetwork attack vector

Authenticated command execution via backup comment

Published Feb 15, 2021 · Updated Aug 3, 2024

OS command injection in Endian Firewall Community 3.3.2 allows remote authenticated users to execute arbitrary commands through a backup comment. The backup workflow passes shell metacharacters embedded in the comment field to a shell, so command substitution such as $(id) runs when the backup starts. Access to the management web application and permission to create a backup are required, and injected commands execute as the nobody account.

CVSS severity8.8
High
EPSS probability2.61%
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 Endian Firewall Community 3.3.2 allows remote authenticated users to execute arbitrary commands through a backup comment. The backup workflow passes shell metacharacters embedded in the comment field to a shell, so command substitution such as $(id) runs when the backup starts. Access to the management web application and permission to create a backup are required, and injected commands execute as the nobody account.

The record

CVE
CVE-2021-27201
Published
Feb 15, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-78, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 15, 2021CVE 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5NVDAV:N/AC:L/Au:S/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-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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