CVE-2021-34204

Name: CVE-2021-34204
Creator: NVD / NIST
Published: 2021-06-16T20:15:07.647+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.8/10EPSS 1.35%

Last modified Jun 17, 2026

CVE-2021-34204 is a medium-severity vulnerability rated 6.8/10 on the CVSS scale. D-Link DIR-2640-US 1.01B04 is affected by Insufficiently Protected Credentials. D-Link AC2600(DIR-2640) stores the device system account password in plain text. EPSS estimates a 1.35% chance of exploitation in the next 30 days.

Description

D-Link DIR-2640-US 1.01B04 is affected by Insufficiently Protected Credentials. D-Link AC2600(DIR-2640) stores the device system account password in plain text. It does not use linux user management. In addition, the passwords of all devices are the same, and they cannot be modified by normal users. An attacker can easily log in to the target router through the serial port and obtain root privileges.

Metrics

CVSS 3.1

6.8/10

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

EPSS Probability

1.35%

68.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-522

Affected Software

Vendor	Product	Versions
Dlink	Dir-2640-Us Firmware	1.01b04

References

http://d-link.comBroken Link
http://dir-2640-us.comBroken Link, URL Repurposed
https://github.com/liyansong2018/CVE/tree/main/2021/CVE-2021-34204Exploit, Third Party Advisory
https://www.dlink.com/en/security-bulletin/Vendor Advisory
http://d-link.comBroken Link
http://dir-2640-us.comBroken Link, URL Repurposed
https://github.com/liyansong2018/CVE/tree/main/2021/CVE-2021-34204Exploit, Third Party Advisory
https://www.dlink.com/en/security-bulletin/Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-34204?

How severe is CVE-2021-34204?

CVE-2021-34204 has a CVSS score of 6.8/10 (MEDIUM severity). The EPSS model estimates a 1.35% probability of exploitation in the next 30 days.

How do I fix CVE-2021-34204?

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-2021-34204?

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

Scan your code now

Source: NVD / NIST