CVE-2026-4194
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Improper Access Control in D-Link system_mgr.cgi Enables Remote Exploit

Publication date: 2026-03-16

Last updated on: 2026-04-29

Assigner: VulDB

Description
A vulnerability was detected 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. The impacted element is the function cgi_set_wto of the file /cgi-bin/system_mgr.cgi. Performing a manipulation results in improper access controls. Remote exploitation of the attack is possible. The exploit is now public and may be used.

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Meta Information

Published
2026-03-16
Last Modified
2026-04-29
Generated
2026-07-06
AI Q&A
2026-03-16
EPSS Evaluated
2026-07-05
NVD
CVE-2026-4194
EUVD
EUVD-2026-12260

Affected Vendors & Products

Showing 20 associated CPEs
Vendor Product Version / Range
dlink dnr-202l_firmware to 2026-02-05 (inc)
dlink dnr-326_firmware to 2026-02-05 (inc)
dlink dns-1100-4_firmware to 2026-02-05 (inc)
dlink dns-120_firmware to 2026-02-05 (inc)
dlink dns-1200-05_firmware to 2026-02-05 (inc)
dlink dns-1550-04_firmware to 2026-02-05 (inc)
dlink dns-315l_firmware to 2026-02-05 (inc)
dlink dns-320_firmware to 2026-02-05 (inc)
dlink dns-320l_firmware to 2026-02-05 (inc)
dlink dns-320lw_firmware to 2026-02-05 (inc)
dlink dns-321_firmware to 2026-02-05 (inc)
dlink dns-322l_firmware to 2026-02-05 (inc)
dlink dns-323_firmware to 2026-02-05 (inc)
dlink dns-325_firmware to 2026-02-05 (inc)
dlink dns-326_firmware to 2026-02-05 (inc)
dlink dns-327l_firmware to 2026-02-05 (inc)
dlink dns-340l_firmware to 2026-02-05 (inc)
dlink dns-343_firmware to 2026-02-05 (inc)
dlink dns-345_firmware to 2026-02-05 (inc)
dlink dns-726-4_firmware to 2026-02-05 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-284 The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
CWE-266 A product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor.

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Executive Summary

This vulnerability affects multiple D-Link devices, including models DNS-120, DNR-202L, DNS-315L, DNS-320 series, DNS-321, and others up to version 20260205. It is located in the function cgi_set_wto within the file /cgi-bin/system_mgr.cgi. The issue arises from improper access controls that can be manipulated remotely, allowing an attacker to exploit the device without needing authentication.

Compliance Impact

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Detection Guidance

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Impact Analysis

The vulnerability allows remote attackers to bypass access controls on affected D-Link devices. This can lead to unauthorized access, potentially compromising the confidentiality, integrity, and availability of the device and its data. Since the exploit is publicly available, the risk of exploitation is higher, which could result in device takeover or disruption of services.

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