CVE-2021-35049Public exploitNetwork attack vector

Root command execution via crafted HTTP request

Published Jun 25, 2021 · Updated Sep 16, 2024

OS command injection in Fidelis Network and Fidelis Deception before 9.3.7 and 9.4 allows remote authenticated users to execute commands. A CommandPost web-interface handler passes crafted HTTP request data to a system command without neutralizing shell metacharacters and returns the command output. A valid CommandPost session is required, and successful injection runs root-level commands on CommandPost and managed Fidelis devices.

CVSS severity9.9
Critical
EPSS probability4.61%
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 Fidelis Network and Fidelis Deception before 9.3.7 and 9.4 allows remote authenticated users to execute commands. A CommandPost web-interface handler passes crafted HTTP request data to a system command without neutralizing shell metacharacters and returns the command output. A valid CommandPost session is required, and successful injection runs root-level commands on CommandPost and managed Fidelis devices.

The record

CVE
CVE-2021-35049
Published
Jun 25, 2021
Updated
Sep 16, 2024
Vendor
Fidelis Security
Product
Fidelis Network
Classifications
CWE-78, CWE-89, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Fidelis Network <9.3.7
  2. Affected versionversion=Fidelis Network 9.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Fidelis Security · Fidelis Networkversion=Fidelis Network <9.3.7; version=Fidelis Network 9.4
Fidelis Security · Fidelis Deceptionversion=Fidelis Deception <9.3.7; version=Fidelis Deception 9.4

Published CVSS scores

8.8National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5National Vulnerability DatabaseAV:N/AC:L/Au:S/C:P/I:P/A:P
9.9Fidelis Cybersecurity, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/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.

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')
CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL 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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