CVE-2021-21913

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-09-23 · updated 2026-06-17
Weakness: CWE-798

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.

Affected products

D-Link DIR-3040: 1.13b03

References

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1361
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1361

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