CVE-2026-4211

| EUVD-2026-12284 HIGH
2026-03-16 VulDB
8.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
PoC Detected
Mar 16, 2026 - 14:53 vuln.today
Public exploit code
Analysis Generated
Mar 16, 2026 - 04:00 vuln.today
EUVD ID Assigned
Mar 16, 2026 - 04:00 euvd
EUVD-2026-12284
CVE Published
Mar 16, 2026 - 03:32 nvd
HIGH 8.8

Tags

D-Link Buffer Overflow Stack Overflow Dns 315l Dns 120 Dns 327l Dnr 322l Dns 345 Dns 323 Dnr 326 Dns 726 4 Dns 321 Dns 340l Dns 320 Dns 326 Dnr 202l Dns 1550 04 Dns 343 Dns 1200 05 Dns 325 Dns 320l Dns 320lw Dns 1100 4

Description

A weakness has been identified 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. Affected by this issue is the function Local_Backup_Info of the file /cgi-bin/local_backup_mgr.cgi. This manipulation of the argument f_idx causes stack-based buffer overflow. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks.

Analysis

Stack-based buffer overflow in D-Link DNS and DNR network storage devices allows authenticated remote attackers to execute arbitrary code by manipulating the f_idx parameter in the local_backup_mgr.cgi endpoint. Public exploit code exists for this vulnerability, which affects multiple device models up to firmware version 20260205 with no patch currently available. …

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Remediation

Within 24 hours: Identify and inventory all affected D-Link DNS/DNR models in your environment and assess their network exposure. Within 7 days: Implement network segmentation to restrict NAS access to authorized users only, disable remote administration features if not essential, and deploy intrusion detection signatures for CVE-2026-4211 exploitation attempts. …

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Priority Score

64
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +44
POC: +20

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CVE-2026-4211 vulnerability details – vuln.today
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