Vulnerability Monitor

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CVE-2021-34201

D-Link DIR-2640-US 1.01B04 is vulnerable to Buffer Overflow. There are multiple out-of-bounds vulnerabilities in some processes of D-Link AC2600(DIR-2640). Local ordinary users can overwrite the global variables in the .bss section, causing the process crashes or changes.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.1, requiring local system access to exploit with relatively low complexity without requiring user interaction requiring only low-level privileges . The vulnerability impacts integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 2 products from dlink, from dlink organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2021, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2021-06-16T20:15:07.573

Last Modified

2024-11-21T06:10:00.397

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.1 (HIGH)

CVSSv2 Vector

AV:L/AC:L/Au:N/C:N/I:P/A:P

Access Vector: LOCAL
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: PARTIAL
Availability Impact: PARTIAL

Exploitability Score

3.9

Impact Score

4.9

Weaknesses

Type: Primary
CWE-787

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	dlink	dir-2640-us_firmware	1.01b04	Yes
Hardware	dlink	dir-2640-us	-	No

References

http://d-link.com Product ([email protected])
http://dir-2640-us.com Product, URL Repurposed ([email protected])
https://github.com/liyansong2018/CVE/tree/main/2021/CVE-2021-34201 Exploit, Third Party Advisory ([email protected])
https://www.dlink.com/en/security-bulletin/ Vendor Advisory ([email protected])
http://d-link.com Product (af854a3a-2127-422b-91ae-364da2661108)
http://dir-2640-us.com Product, URL Repurposed (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/liyansong2018/CVE/tree/main/2021/CVE-2021-34201 Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.dlink.com/en/security-bulletin/ Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For dlink's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.