D-Link DIR-2640-US 1.01B04 is vulnerable to Incorrect Access Control. Router ac2600 (dir-2640-us), when setting PPPoE, will start quagga process in the way of whole network monitoring, and this function uses the original default password and port. An attacker can easily use telnet to log in, modify routing information, monitor the traffic of all devices under the router, hijack DNS and phishing attacks. In addition, this interface is likely to be questioned by customers as a backdoor, because the interface should not be exposed.
References
| Link | Resource |
|---|---|
| https://github.com/liyansong2018/CVE/tree/main/2021/CVE-2021-34203 | Exploit Third Party Advisory |
| https://www.dlink.com/en/security-bulletin/ | Vendor Advisory |
| https://github.com/liyansong2018/CVE/tree/main/2021/CVE-2021-34203 | Exploit Third Party Advisory |
| https://www.dlink.com/en/security-bulletin/ | Vendor Advisory |
Configurations
Configuration 1 (hide)
| AND |
|
History
09 Jul 2026, 01:16
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
21 Nov 2024, 06:10
| Type | Values Removed | Values Added |
|---|---|---|
| References | () http://d-link.com - Vendor Advisory | |
| References | () http://dir-2640-us.com - Broken Link, URL Repurposed | |
| References | () https://github.com/liyansong2018/CVE/tree/main/2021/CVE-2021-34203 - Exploit, Third Party Advisory | |
| References | () https://www.dlink.com/en/security-bulletin/ - Vendor Advisory |
14 Feb 2024, 01:17
| Type | Values Removed | Values Added |
|---|---|---|
| References | (MISC) http://dir-2640-us.com - Broken Link, URL Repurposed |
Information
Published : 2021-06-16 20:15
Updated : 2026-07-09 01:16
NVD link : CVE-2021-34203
Mitre link : CVE-2021-34203
CVE.ORG link : CVE-2021-34203
JSON object : View
Products Affected
dlink
- dir-2640-us_firmware
- dir-2640-us
CWE
CWE-1188
Insecure Default Initialization of Resource