CVE-2026-4203 D-Link DNS-1550-04 network_mgr.cgi cgi_dhcpd command injection
Remote attackers can execute arbitrary commands on D-Link NAS devices via the network_mgr.cgi script, potentially compromising the device.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4203?
CVE-2026-4203 is a medium-severity command injection vulnerability in Dlink Dns-320 Firmware, published on 16 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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. Impacted is the function cgi_portforwarding_add/cgi_portforwarding_del/cgi_portforwarding_modify/cgi_portforwarding_add_scan/cgi_dhcpd_lease/cgi_ddns/cgi_ip/cgi_dhcpd of the file /cgi-bin/network_mgr.cgi. The manipulation results in command injection. The attack may be launched remotely. The exploit is now public and may be used.
Which versions are affected by CVE-2026-4203?
It affects 20 products.
Products include Dlink Dnr-202l Firmware, Dlink Dnr-326 Firmware, Dlink Dns-1100-4 Firmware, Dlink Dns-1200-05 Firmware, Dlink Dns-120 Firmware, Dlink Dns-1550-04 Firmware and 14 more.
How do I fix CVE-2026-4203?
No fix has been published for CVE-2026-4203 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-4203 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4203 exists.
Other vulnerabilities in Dlink Dns-320 Firmware
- CVE-2024-3272 D-Link Multiple NAS Devices Use of Hard-Coded Credentials
- CVE-2024-3273 D-Link Multiple NAS Devices Command Injection
- CVE-2026-5211 D-Link DNS-1550-04 app_mgr.cgi UPnP_AV_Server_Path_Del stack-based overflow
- CVE-2026-5212 D-Link DNS-1550-04 webdav_mgr.cgi Webdav_Upload_File stack-based overflow
- CVE-2026-5213 D-Link DNS-1550-04 account_mgr.cgi cgi_adduser_to_session stack-based overflow
Sources
Also known as GHSA-76q2-vqq4-gj3h.