CVE-2021-44620Network attack vector

Arbitrary command execution via hosTime injection

Published Mar 11, 2022 · Updated Jul 9, 2026

Command injection in TOTOLINK A3100R 4.1.2cu.5050_B20200504 and earlier allows remote attackers to execute arbitrary commands. The adm/ntm.asp endpoint accepts a crafted hosTime parameter, but public sources do not disclose how the value reaches a command interpreter. Successful exploitation runs attacker-chosen commands on the router without authentication or user interaction.

CVSS severity9.8
Critical
EPSS probability1.35%
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 A3100R 4.1.2cu.5050_B20200504 and earlier allows remote attackers to execute arbitrary commands. The adm/ntm.asp endpoint accepts a crafted hosTime parameter, but public sources do not disclose how the value reaches a command interpreter. Successful exploitation runs attacker-chosen commands on the router without authentication or user interaction.

The record

CVE
CVE-2021-44620
Published
Mar 11, 2022
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, CAPEC-248, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 11, 2022CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record 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

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CAPEC-248Command Injection
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

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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