CVE-2021-34203

HIGH
8.1
CVSS Score
Published: June 16, 2021 at 07:02 PM UTC
Updated: July 9, 2026 at 01:16 AM UTC
2 products affected across 1 vendorDir 2640-us FirmwareDir-2640-Us

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Severity
HIGH8.1
Exploit prediction
EPSS 1%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

dlink-dir-2640-us (same device)
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

CVSS

Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-1188

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