TI-2021-13310 Aliases CVE-2021-34204 GHSA-m45q-r6x2-5q77

D-Link DIR-2640-US 1.01B04 is affected by Insufficiently Protected Credentials.

LOW 32CWE-522Published 2021-06-16 · Updated 2026-07-09

Key facts

Attack vector: Physical
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Information disclosure
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-522.

Summary

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.

Why it matters now

EPSS 0.01115 66th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:o:dlink:dir-2640-us_firmware:1.01b04:::::::*	1.01b04	Vulnerable	D-Link Japan K.K.
cpe:2.3:h:dlink:dir-2640-us:-:::::::*	not specified by NVD	Running on	D-Link Japan K.K.

cpe:2.3:o:dlink:dir-2640-us_firmware:1.01b04:*:*:*:*:*:*:* Versions 1.01b04 Vulnerable ·D-Link Japan K.K.
cpe:2.3:h:dlink:dir-2640-us:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·D-Link Japan K.K.

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-34204
2026-10-03 Alias added: GHSA-m45q-r6x2-5q77

References

Exploit 1

https://github.com/liyansong2018/CVE/tree/main/2021/CVE-2021-34204

Advisory 1

https://www.dlink.com/en/security-bulletin/

TI-2021-03434 Path traversal in Quagga Services on D-Link DIR-2640 Routers CVSS 3.1HIGH 8.4
TI-2021-03432 Hard-coded credentials in Quagga Services on D-Link DIR-2640 Routers CVSS 3.1HIGH 8.8
TI-2021-13308 There are multiple out-of-bounds vulnerabilities in some processes of D-Link… CVSS 3.1HIGH 7.8
TI-2021-13309 D-Link DIR-2640-US 1.01B04 is vulnerable to Incorrect Access Control. CVSS 3.1HIGH 8.1
TI-2021-13307 D-Link DIR-2640-US 1.01B04 is vulnerable to Buffer Overflow. CVSS 3.1HIGH 7.1
TI-2021-03433 Path traversal in Quagga Services on D-Link DIR-2640 Routers CVSS 3.1MEDIUM 6.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences