CVE-2021-42165Public exploitNetwork attack vector

Root shell access via unsanitized path parameter

Published May 3, 2022 · Updated Aug 4, 2024

OS command injection in MitraStar GPT-2541GNAC-N1 firmware 100VNZ0b33 allows remote authenticated users to obtain root access over SSH. The reduced CLI passes shell metacharacters in the deviceinfo show file path parameter to a command interpreter, so &&/bin/bash launches an unrestricted BusyBox shell. Access requires the router's support SSH credentials; the resulting root shell can alter /etc/passwd, create users, and modify any system resource.

CVSS severity8.8
High
EPSS probability14.10%
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 MitraStar GPT-2541GNAC-N1 firmware 100VNZ0b33 allows remote authenticated users to obtain root access over SSH. The reduced CLI passes shell metacharacters in the deviceinfo show file path parameter to a command interpreter, so &&/bin/bash launches an unrestricted BusyBox shell. Access requires the router's support SSH credentials; the resulting root shell can alter /etc/passwd, create users, and modify any system resource.

The record

CVE
CVE-2021-42165
Published
May 3, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-78, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 3, 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 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')
T1059.004Command 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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