CVE-2021-21820

9.8 criticalEPSS 3.0%

Critical (9.8) in dlink dir-3040 firmware. EPSS 3.0% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.8 critical

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

EPSS: 3.0% chance of exploitation in the next 30 days; higher than 87% of CVEs (scores of 2026-10-31)
CWE: CWE-798
Published: 2021-07-16
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

dlink:dir-3040_firmware

References

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

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