CVE-2021-45836Public exploitNetwork attack vector

Root command execution via unsanitized name parameter

Published Apr 25, 2022 · Updated Aug 4, 2024

OS command injection in TerraMaster F2-210 and F4-210 TOS 4.2.X build 4.2.15-2107141517 allows remote authenticated users to execute as root. The hand_app action concatenates its name parameter into a command string that PHP passes to shell_exec or system without neutralizing shell metacharacters. Any authenticated non-administrator account can trigger blind command execution with root privileges, allowing complete control of stored data and device operation.

CVSS severity8.8
High
EPSS probability2.48%
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 TerraMaster F2-210 and F4-210 TOS 4.2.X build 4.2.15-2107141517 allows remote authenticated users to execute as root. The hand_app action concatenates its name parameter into a command string that PHP passes to shell_exec or system without neutralizing shell metacharacters. Any authenticated non-administrator account can trigger blind command execution with root privileges, allowing complete control of stored data and device operation.

The record

CVE
CVE-2021-45836
Published
Apr 25, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 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

9.0NIST NVDAV:N/AC:L/Au:S/C:C/I:C/A:C
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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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