CVE intelligence and bounded remediation

CVE-2026-4194 — Dlink Dnr-202L Firmware security vulnerability

Critical CVSS 9.8

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.

Severity
Critical
CVSS
9.8 (3.1)
Published
2026-03-16
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-266, CWE-284

Affected products

  • dlink / dnr-202l_firmware
  • dlink / dnr-326_firmware
  • dlink / dns-1100-4_firmware
  • dlink / dns-120_firmware
  • dlink / dns-1200-05_firmware
  • dlink / dns-1550-04_firmware

Showing 6 representative product identities from 20 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Privilege escalation and unsafe privilege management

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Map service accounts, operating-system identities, roles, capabilities, impersonation, set-user transitions, and administrative helper paths.
  • Determine whether untrusted users or lower-privilege processes can reach the affected transition or modify inputs it trusts.
  • Review file, socket, registry, device, job, container, and cloud-role permissions used before and after privilege changes.

Remediate safely

  • Apply the supported fix and redesign privileged operations as a minimal, authenticated, allowlisted interface.
  • Drop privileges before processing untrusted input, verify the drop succeeds, and remove unnecessary roles, capabilities, and write permissions.
  • Validate ownership and permissions at time of use and add explicit lower-to-higher privilege boundary tests.

Authoritative sources

Complete CVE record and remediation plan

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