CVE-2021-45837Known exploitationPublic exploitNetwork attack vector

Root command execution via unsanitized app name

Published Apr 25, 2022 · Updated Aug 4, 2024

Command injection in TerraMaster F2-210 and F4-210 TOS 4.2.15-2107141517 allows remote attackers to execute commands as root. The app/del handler in tos/controller/app.class.php concatenates the attacker-controlled name parameter into a system() call without sanitization. The handler requires a user session, but documented companion flaws permit session forgery; successful exploitation grants full control of the NAS.

CVSS severity9.8
Critical
EPSS probability15.96%
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 TerraMaster F2-210 and F4-210 TOS 4.2.15-2107141517 allows remote attackers to execute commands as root. The app/del handler in tos/controller/app.class.php concatenates the attacker-controlled name parameter into a system() call without sanitization. The handler requires a user session, but documented companion flaws permit session forgery; successful exploitation grants full control of the NAS.

The record

CVE
CVE-2021-45837
Published
Apr 25, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1059
Attack vector
network
Privileges
unauthenticated

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 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
10.0NIST NVDAV:N/AC:L/Au:N/C:C/I:C/A:C

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

T1059Command and Scripting Interpreter

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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