CVE-2021-4144Network attack vector

Authenticated OS command execution via web interface

Published Dec 23, 2021 · Updated Aug 3, 2024

OS command injection in TP-Link TL-WR802N V4(JP) firmware before 211202 allows remote authenticated users to execute arbitrary commands. Public disclosures do not identify the affected handler or explain how a web-interface value reaches an operating-system command. Access requires login to the router's web interface, and successful exploitation grants arbitrary command execution on the device.

CVSS severity7.2
High
EPSS probability1.95%
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 TP-Link TL-WR802N V4(JP) firmware before 211202 allows remote authenticated users to execute arbitrary commands. Public disclosures do not identify the affected handler or explain how a web-interface value reaches an operating-system command. Access requires login to the router's web interface, and successful exploitation grants arbitrary command execution on the device.

The record

CVE
CVE-2021-4144
Published
Dec 23, 2021
Updated
Aug 3, 2024
Vendor
TP-Link
Product
TL-WR802N
Classifications
CWE-78, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 23, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=firmware versions prior to 211202

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TP-Link · TL-WR802Nversion=firmware versions prior to 211202

Published CVSS scores

6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
7.2JPCERT/CCCVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
8.5JPCERT/CCAV:N/AC:M/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command 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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