6.5CVSSMEDIUM
Description
D-Link DIR-2640 HNAP LoginPassword Authentication Bypass Vulnerability. This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of D-Link DIR-2640 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the web management interface, which listens on TCP port 80 by default. A specially crafted login request can cause authentication to succeed without providing proper credentials. An attacker can leverage this vulnerability to bypass authentication on the system. . Was ZDI-CAN-19549.
CVSS Vector Breakdown
Exploitability
AV:AAttack VectorAdjacent
AC:LAttack ComplexityLow
PR:NPrivileges RequiredNone
UI:NUser InteractionNone
Scope
S:UScopeUnchanged
Impact
C:NConfidentialityNone
I:HIntegrityHigh
A:NAvailabilityNone
Weaknesses
Affected Products
Exploitability
Official Patch Available
References
https://www.zerodayinitiative.com/advisories/ZDI-23-544/
zerodayinitiative.com
https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10323
supportannouncement.us.dlink.com
https://www.zerodayinitiative.com/advisories/ZDI-23-544/
zerodayinitiative.com
and 2 more references View all →
Timeline
Published
May 3, 2024
Last Updated
Aug 6, 2025
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