CVE-2021-21816

Name: CVE-2021-21816
Creator: NVD / NIST
Published: 2021-07-16T11:15:09.9+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 36.49%

Last modified Jun 17, 2026

CVE-2021-21816 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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. EPSS estimates a 36.49% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

36.49%

98.3th 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-2021-1281Exploit, Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1281Exploit, Third Party Advisory

Timeline

Published: Jul 16, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21816?

How severe is CVE-2021-21816?

CVE-2021-21816 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 36.49% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21816?

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-2021-21816?

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

Scan your code now

Source: NVD / NIST