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CVE-2021-34203

8.1 · HIGH

D-Link DIR-2640-US 1.01B04 is vulnerable to Incorrect Access Control.

Published Jun 16, 2021CWE-1188EPSS 1.20%

Overview

CVE-2021-34203 is a high-severity vulnerability. It was published on June 16, 2021 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/liyansong2018/CVE/tree/main/2021/CVE-2021-34203Refwww.dlink.com/en/security-bulletin/GitHubgithub.com/liyansong2018/CVE/tree/main/2021/CVE-2021-34203Refwww.dlink.com/en/security-bulletin/

How CyberStrike helps

Frequently asked questions

What is CVE-2021-34203?

CVE-2021-34203 is a high-severity vulnerability. It was published on June 16, 2021 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2021-34203?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-34203?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-34203?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-34203 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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