MEDIUM

CVE-2021-21816

CVSS v3

4.3

MEDIUM

EPSS Score

32.4 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2021-21816 yet.

Full record on NVD

Description

An information disclosure vulnerability exists in the Syslog functionality of D-LINK DIR-3040 1.13B03. A specially crafted network request can lead to the disclosure of sensitive information. An attacker can send an HTTP request to trigger this vulnerability.

Technical details

Published: 2021-07-16

Frequently asked questions

What is CVE-2021-21816?

Is CVE-2021-21816 actively exploited?

Active exploitation of CVE-2021-21816 has not been confirmed. Its EPSS score was 32.4% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-21816?

CVE-2021-21816 has a CVSS v3 base score of 4.3 (MEDIUM severity).

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