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Vulnerability · Published Mar 16, 2026 · Assigned by VulDB

CVE-2026-4214D-Link DNS-1550-04 app_mgr.cgi UPnP_AV_Server_Path_Setting stack-based overflow

High 8.8

In plain English

A high-severity stack buffer overflow in DNR-202L from D-Link. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 58% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.8%top 42.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

A flaw 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 UPnP_AV_Server_Path_Setting of the file /cgi-bin/app_mgr.cgi. Executing a manipulation can lead to stack-based buffer overflow. The attack may be launched remotely. The exploit has been published and may be used.

Affected products (as reported)

VendorProductVersions
D-Link DNS-120 20260205
D-Link DNR-202L 20260205
D-Link DNS-315L 20260205
D-Link DNS-320 20260205
D-Link DNS-320L 20260205
D-Link DNS-320LW 20260205
D-Link DNS-321 20260205
D-Link DNR-322L 20260205
D-Link DNS-323 20260205
D-Link DNS-325 20260205
D-Link DNS-326 20260205
D-Link DNS-327L 20260205
D-Link DNR-326 20260205
D-Link DNS-340L 20260205
D-Link DNS-343 20260205
D-Link DNS-345 20260205
D-Link DNS-726-4 20260205
D-Link DNS-1100-4 20260205
D-Link DNS-1200-05 20260205
D-Link DNS-1550-04 20260205

Weakness: CWE-121, CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R

References