CVE-2021-21913

Name: CVE-2021-21913
Creator: NVD / NIST
Published: 2021-09-23T15:15:07.527+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.12%

Last modified Jun 17, 2026

CVE-2021-21913 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An information disclosure vulnerability exists in the WiFi Smart Mesh functionality of D-LINK DIR-3040 1.13B03. A specially-crafted network request can lead to command execution. EPSS estimates a 2.12% chance of exploitation in the next 30 days.

Description

An information disclosure vulnerability exists in the WiFi Smart Mesh functionality of D-LINK DIR-3040 1.13B03. A specially-crafted network request can lead to command execution. An attacker can connect to the MQTT service to trigger this vulnerability.

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

2.12%

79.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Dlink	Dir-3040 Firmware	1.13b03

References

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1361Exploit, Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1361Exploit, Third Party Advisory

Timeline

Published: Sep 23, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21913?

How severe is CVE-2021-21913?

CVE-2021-21913 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.12% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21913?

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-2021-21913?

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

Scan your code now

Source: NVD / NIST