CVE-2021-43664Public exploitNetwork attack vector

Root command execution via unquoted firmware URL

Published Mar 30, 2022 · Updated Aug 4, 2024

Command injection in TOTOLINK EX300_v2 4.0.3c.140_B20210429 allows man-in-the-middle attackers to execute commands as root. The forceugp update process reads the url value from /var/cloudupg.ini, formats it unquoted into a wget shell command, and passes it to system(). Exploitation requires interception of the device's HTTP firmware check and a crafted response that supplies shell metacharacters in the firmware URL.

CVSS severity8.1
High
EPSS probability1.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in TOTOLINK EX300_v2 4.0.3c.140_B20210429 allows man-in-the-middle attackers to execute commands as root. The forceugp update process reads the url value from /var/cloudupg.ini, formats it unquoted into a wget shell command, and passes it to system(). Exploitation requires interception of the device's HTTP firmware check and a crafted response that supplies shell metacharacters in the firmware URL.

The record

CVE
CVE-2021-43664
Published
Mar 30, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 30, 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

9.3NIST National Vulnerability DatabaseAV:N/AC:M/Au:N/C:C/I:C/A:C
8.1NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:H/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('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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