Which versions of D-Link are affected by CVE-2026-5212?

D-Link NAS devices (DNS and DNR models through firmware 20260205) contain a stack-based buffer overflow in the WebDAV management interface that allows authenticated users to gain complete system…

Is there a public PoC exploit available for CVE-2026-5212?

Yes, a public proof-of-concept exploit is available for CVE-2026-5212. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-5212?

Within 24 hours: Inventory all D-Link DNS and DNR NAS devices in production; verify firmware versions against 20260205 baseline and identify which models are affected per vendor's published vulnerability scope. Within 7 days: Implement network segmentation to restrict WebDAV management access (/cgi-bin/webdav_mgr.cgi) to trusted administrative networks only; disable WebDAV entirely if not operationally required. Within 30 days: Develop a hardware replacement plan for affected end-of-life devices; prioritize migration to vendor-supported NAS solutions with active security patching; document any devices that cannot be immediately replaced and apply compensating controls.

D-Link CVE-2026-5212

Q: What is the CVSS score of CVE-2026-5212?

CVE-2026-5212 has a CVSS 4.0 base score of 7.4 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.1%.

EUVD-2026-17662 HIGH

Stack-based Buffer Overflow (CWE-121)

2026-03-31 VulDB

GHSA-42h9-h8r4-fwqg

D-Link Stack Overflow Buffer Overflow

7.4

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

7.4 HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

PoC Detected

Apr 02, 2026 - 17:15 vuln.today

Public exploit code

EUVD ID Assigned

Mar 31, 2026 - 20:31 euvd

EUVD-2026-17662

Analysis Generated

Mar 31, 2026 - 20:31 vuln.today

CVE Published

Mar 31, 2026 - 20:15 nvd

HIGH 7.4

DescriptionCVE.org

A vulnerability has been found in D-Link DNS-120, DNR-202L, DNS-315L, DNS-320, DNS-320L, DNS-320LW, DNS-321, DNR-322L, DNS-323, DNS-325, DNS-326, DNS-327L, DNR-326, DNS-340L, DNS-343, DNS-345, DNS-726-4, DNS-1100-4, DNS-1200-05 and DNS-1550-04 up to 20260205. This issue affects the function Webdav_Upload_File of the file /cgi-bin/webdav_mgr.cgi. The manipulation of the argument f_file leads to stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit has been disclosed to the public and may be used.

Articles & Coverage 1

vuln.today Threat Landscape 30/03-06/04/2026: Chrome Zero-Day, TrueConf Supply Chain, ShareFile Kill Chain Apr 06, 2026

AnalysisAI

Stack-based buffer overflow in D-Link NAS devices enables authenticated remote attackers to execute arbitrary code with full system privileges. Affecting 20+ end-of-life D-Link DNS and DNR network storage models through firmware version 20260205, the flaw resides in the Webdav_Upload_File function within /cgi-bin/webdav_mgr.cgi. Publicly available exploit code exists, significantly lowering the barrier to exploitation. CVSS 8.8 (High) reflects network-accessible attack requiring only low-privilege authentication with no user interaction. Organizations using these legacy devices face immediate risk of complete confidentiality, integrity, and availability compromise.