CVE-2021-21820

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.0% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-07-16 · updated 2026-06-17
Weakness: CWE-798

Description

A hard-coded password vulnerability exists in the Libcli Test Environment functionality of D-LINK DIR-3040 1.13B03. A specially crafted network request can lead to code execution. An attacker can send a sequence of requests to trigger this vulnerability.

Affected products

D-Link DIR-3040: 1.13b03

References

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1285
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1285

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