Stack-based Buffer Overflow in D-Link Network Devices
CVE-2026-5211

8.7HIGH

Key Information:

Vendor

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

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5211?

A buffer overflow vulnerability exists in multiple D-Link network devices, specifically affecting the UPnP_AV_Server_Path_Del functionality within the /cgi-bin/app_mgr.cgi file. By manipulating the f_dir parameter, remote attackers can exploit this flaw, potentially leading to arbitrary code execution. The issue affects a variety of devices up to a certain firmware version, making it critical for users to secure their devices against potential exploits.

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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-2026-5211 - Proof of Concept

References

https://vuldb.com/vuln/354347
vdb-entrytechnical-description
https://vuldb.com/vuln/354347/cti
signaturepermissions-required
https://vuldb.com/submit/780434
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

Ziyue Xie (VulDB User)
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