Stack-based Buffer Overflow in D-Link DNS Products
CVE-2026-4214

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-2026-4214?

A vulnerability has been identified in multiple D-Link DNS devices that affects the UPnP_AV_Server_Path_Setting functionality within the /cgi-bin/app_mgr.cgi file. This flaw allows for a stack-based buffer overflow, which can be exploited remotely. Successful exploitation could lead to arbitrary code execution on the affected devices, posing significant security risks to users. Mitigation strategies are necessary to safeguard against potential remote attacks exploiting this flaw.

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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-2026-4214 - Proof of Concept

References

https://vuldb.com/?id.351125
vdb-entrytechnical-description
https://vuldb.com/?ctiid.351125
signaturepermissions-required
https://vuldb.com/?submit.770445
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

pjq123 (VulDB User)
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