CVEvulnerability
CVE-2021-34203
8.1 HIGH
Official page ↗
- Status
- Modified
- Published
- 2021-06-16
- Last modified
- 2026-07-09
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 8.1 HIGH — CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- CVSS 2.0 ([email protected])
- 4.8 MEDIUM — AV:A/AC:L/Au:N/C:P/I:P/A:N
- Weaknesses
- CWE-1188
Description
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.
Affected configurations
• dlink dir-2640-us firmware 1.01b04
Related
Weakness · CWE (1)
- CWE-1188 Initialization of a Resource with an Insecure Default weakness
References
- 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