CVE-2021-26810

Name: CVE-2021-26810
Creator: NVD / NIST
Published: 2021-03-30T14:15:13.607+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 4.91%

Last modified Jun 17, 2026

CVE-2021-26810 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. D-link DIR-816 A2 v1.10 is affected by a remote code injection vulnerability. An HTTP request parameter can be used in command string construction in the handler function of the /goform/dir_setWanWifi, which can lead to command injection via shell metacharacters in the statuscheckpppoeuser parameter.. EPSS estimates a 4.91% chance of exploitation in the next 30 days.

Description

D-link DIR-816 A2 v1.10 is affected by a remote code injection vulnerability. An HTTP request parameter can be used in command string construction in the handler function of the /goform/dir_setWanWifi, which can lead to command injection via shell metacharacters in the statuscheckpppoeuser parameter.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

4.91%

91.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Dlink	Dir-816 Firmware	1.10b05

References

https://github.com/GD008/vuln/blob/main/DIR-816.mdExploit, Third Party Advisory
https://www.dlink.com/en/security-bulletin/Vendor Advisory
https://github.com/GD008/vuln/blob/main/DIR-816.mdExploit, Third Party Advisory
https://www.dlink.com/en/security-bulletin/Vendor Advisory

Timeline

Published: Mar 30, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-26810?

How severe is CVE-2021-26810?

CVE-2021-26810 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 4.91% probability of exploitation in the next 30 days.

How do I fix CVE-2021-26810?

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-2021-26810?

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

Scan your code now

Source: NVD / NIST