CVE-2021-34203

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Summary

CVECVE-2021-34203
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-06-16 20:15:07 UTC
Updated2026-07-09 01:16:55 UTC
DescriptionD-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.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from [email protected]

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.012160000 probability, percentile 0.649580000 (date 2026-07-09)

Problem Types: CWE-1188 | n/a

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary8.1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
2.0[email protected]Primary4.8AV:A/AC:L/Au:N/C:P/I:P/A:N

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v2.0 Breakdown

Access Vector
Adjacent
Access Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Hardware Dlink Dir-2640-us - All All All
Operating System Dlink Dir-2640-us Firmware 1.01b04 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
CVE/2021/CVE-2021-34203 at main · liyansong2018/CVE · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Exploit, Third Party Advisory
Security Bulletin | D-Link af854a3a-2127-422b-91ae-364da2661108 www.dlink.com Vendor Advisory
d-link.com MITRE d-link.com
dir-2640-us.com MITRE dir-2640-us.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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