EUVD-2026-17662
GHSA-42h9-h8r4-fwqg
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessAuthenticate to WebDAV management interface
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ExploitSend crafted f_file parameter to /cgi-bin/webdav_mgr.cgi
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ExecutionTrigger stack-based buffer overflow
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ImpactExecute arbitrary code with device privileges
Vulnerability Assessment
| Weakness |
CWE
ASVS 5.0
V15 - Secure Coding and Architecture Stack buffer bounds checking
MITRE ATT&CK
1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | Requires authenticated access to D-Link DNS/DNR NAS devices (multiple models up to firmware 20260205). Attacker must have valid login credentials to access the WebDAV functionality at /cgi-bin/webdav_mgr.cgi and upload a crafted file with oversized f_file parameter to trigger stack buffer overflow. |
| Exploit ScenarioDerived | An authenticated attacker sends a malicious HTTP request with an oversized f_file parameter to the WebDAV upload function, triggering a stack buffer overflow. This allows arbitrary code execution on vulnerable D-Link NAS devices, compromising confidentiality and integrity. |
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Alert meAnalysisAIv1 – Mar 31, 2026
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.
Affected VersionsENISA
Affects your stack
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
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
Primary rating from Vendor (VulDB) · only source for this CVE.
CVSS VectorVendor: VulDB
Lifecycle Timeline
2DescriptionCVE.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
Executive ViewAI
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 control, potentially exposing stored data and disrupting business operations. With publicly available exploit code and no vendor patch available, organizations relying on these legacy devices face immediate risk of unauthorized access and data compromise.
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.
No vendor-released patch identified at time of analysis. Interim mitigations: (1) Restrict network access to WebDAV management interface via firewall rules; (2) Disable WebDAV service if not required for operations; (3) Enforce strong authentication credentials for any remaining administrative access; (4) Monitor affected devices for suspicious activity targeting /cgi-bin/webdav_mgr.cgi; (5) Isolate affected NAS devices to air-gapped or highly restricted networks; (6) Plan expedited replacement with supported hardware as primary remediation.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.
A stack-based buffer overflow occurs when a program writes more data to a buffer located on the stack than it was allocated to hold.
Stack-based buffer overflow in D-Link DNS storage appliances (DNS-120, DNS-340L, DNS-1200-05 and others) through the /cg
Stack-based buffer overflow in D-Link NAS devices (DNS-120, DNR-202L, DNS-315L, DNS-320 series, DNS-326, DNS-1100-4, and
Stack-based buffer overflow in D-Link DNS NAS devices (DNS-120 through DNS-1550-04) allows authenticated attackers to ac
Stack-based buffer overflow in D-Link DNS and DNR network storage devices allows authenticated remote attackers to execu
Stack-based buffer overflow in D-Link NAS device management interfaces allows authenticated remote attackers to execute
Stack-based buffer overflow in D-Link NAS devices allows authenticated remote attackers to achieve complete system compr
Stack-based buffer overflow in D-Link NAS devices enables remote code execution with high integrity impact for authentic
Improper access controls in D-Link network-attached storage devices (DNS-120 through DNS-1550-04, firmware versions up t
Command injection in D-Link NAS devices (DNS-320, DNS-327L, DNS-345 and others) through the time_machine.cgi script allo
A security vulnerability in A flaw (CVSS 6.3). Risk factors: public PoC available.
A security vulnerability in A vulnerability (CVSS 6.3). Risk factors: public PoC available.
A security vulnerability in A vulnerability (CVSS 6.3). Risk factors: public PoC available.
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