Stack-Based Buffer Overflow in D-Link Network Storage Devices
CVE-2026-5212

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-2026-5212?

A stack-based buffer overflow vulnerability has been identified in several D-Link network storage devices. This issue affects the WebDAV upload functionality in the file /cgi-bin/webdav_mgr.cgi. An attacker can exploit this vulnerability by manipulating the 'f_file' argument, potentially allowing unauthorized remote access. The exploit has been publicly disclosed, which increases the risk of exploitation. Users of the affected D-Link products should be aware of this serious security concern and apply mitigations as recommended by the vendor.

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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-2026-5212 - Proof of Concept

References

https://vuldb.com/vuln/354348
vdb-entrytechnical-description
https://vuldb.com/vuln/354348/cti
signaturepermissions-required
https://vuldb.com/submit/780435
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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