CVE-2021-44827

Name: CVE-2021-44827
Creator: NVD / NIST
Published: 2022-03-04T22:15:19.193+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 53.96%

Last modified Jun 17, 2026

CVE-2021-44827 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. There is remote authenticated OS command injection on TP-Link Archer C20i 0.9.1 3.2 v003a.0 Build 170221 Rel.55462n devices vie the X_TP_ExternalIPv6Address HTTP parameter, allowing a remote attacker to run arbitrary commands on the router with root privileges.. EPSS estimates a 53.96% chance of exploitation in the next 30 days.

Description

There is remote authenticated OS command injection on TP-Link Archer C20i 0.9.1 3.2 v003a.0 Build 170221 Rel.55462n devices vie the X_TP_ExternalIPv6Address HTTP parameter, allowing a remote attacker to run arbitrary commands on the router with root privileges.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

53.96%

98.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Tp-Link	Archer C20i Firmware	<= 170221

References

https://Full-Disclosure.euExploit, Third Party Advisory
https://full-disclosure.eu/reports/2022/CVE-2021-44827-tplink-authenticated-remote-code-execution.htmlExploit, Third Party Advisory
https://www.tp-link.com/us/securityVendor Advisory
https://Full-Disclosure.euExploit, Third Party Advisory
https://full-disclosure.eu/reports/2022/CVE-2021-44827-tplink-authenticated-remote-code-execution.htmlExploit, Third Party Advisory
https://www.tp-link.com/us/securityVendor Advisory

Timeline

Published: Mar 4, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-44827?

How severe is CVE-2021-44827?

CVE-2021-44827 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 53.96% probability of exploitation in the next 30 days.

How do I fix CVE-2021-44827?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-44827?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST