Stack-Based Buffer Overflow in D-Link Network Attached Storage Devices
CVE-2026-4211

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-2026-4211?

A stack-based buffer overflow vulnerability has been discovered in multiple D-Link Network Attached Storage devices, affecting their local backup management functionality. This flaw exists in the Local_Backup_Info function of the file /cgi-bin/local_backup_mgr.cgi, where improper handling of the argument f_idx allows an attacker to exploit this weakness remotely. The exploit is public, raising significant security concerns for users of the affected devices.

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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-2026-4211 - Proof of Concept

References

https://vuldb.com/?id.351122
vdb-entrytechnical-description
https://vuldb.com/?ctiid.351122
signaturepermissions-required
https://vuldb.com/?submit.770441
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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