Stack-Based Buffer Overflow in D-Link Network Storage Devices
CVE-2026-4213

8.7HIGH

Key Information:

Vendor

D-link
Status
Dns-120
Dnr-202l
Dns-315l
Dns-320
Vendor
CVE Published:
16 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4213?

A vulnerability exists within various D-Link network storage devices due to a stack-based buffer overflow in the cgi_myfavorite_del_user and cgi_myfavorite_verify functions located in /cgi-bin/gui_mgr.cgi. Remote exploitation of this vulnerability may lead to unauthorized access or denial of service, posing significant security risks to impacted devices. The exploit is publicly available, urging users to take immediate action to secure their systems.

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Affected Version(s)

DNR-202L 20260205

DNR-322L 20260205

DNR-326 20260205

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-4213 - Proof of Concept

References

https://vuldb.com/?id.351124
vdb-entrytechnical-description
https://vuldb.com/?ctiid.351124
signaturepermissions-required
https://vuldb.com/?submit.770443
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

pjqwudi (VulDB User)
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