CVE-2026-4203

Name: CVE-2026-4203
Creator: NVD / NIST
Published: 2026-03-16T14:20:05.323+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 2.1/10EPSS 3.83%

Last modified Jun 17, 2026

CVE-2026-4203 is a low-severity vulnerability rated 2.1/10 on the CVSS scale. 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. EPSS estimates a 3.83% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS 4.0

2.1/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

3.83%

88.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Dlink	Dnr-202l Firmware	<= 2026-02-05
Dlink	Dnr-326 Firmware	<= 2026-02-05
Dlink	Dns-1100-4 Firmware	<= 2026-02-05
Dlink	Dns-120 Firmware	<= 2026-02-05
Dlink	Dns-1200-05 Firmware	<= 2026-02-05
Dlink	Dns-1550-04 Firmware	<= 2026-02-05
Dlink	Dns-315l Firmware	<= 2026-02-05
Dlink	Dns-320 Firmware	<= 2026-02-05
Dlink	Dns-320l Firmware	<= 2026-02-05
Dlink	Dns-320lw Firmware	<= 2026-02-05
Dlink	Dns-321 Firmware	<= 2026-02-05
Dlink	Dns-322l Firmware	<= 2026-02-05
Dlink	Dns-323 Firmware	<= 2026-02-05
Dlink	Dns-325 Firmware	<= 2026-02-05
Dlink	Dns-326 Firmware	<= 2026-02-05
Dlink	Dns-327l Firmware	<= 2026-02-05
Dlink	Dns-340l Firmware	<= 2026-02-05
Dlink	Dns-343 Firmware	<= 2026-02-05
Dlink	Dns-345 Firmware	<= 2026-02-05
Dlink	Dns-726-4 Firmware	<= 2026-02-05

References

https://github.com/wudipjq/my_vuln/blob/main/D-Link8/vuln_122/122.mdExploit, Third Party Advisory
https://github.com/wudipjq/my_vuln/blob/main/D-Link8/vuln_123/123.mdExploit, Third Party Advisory
https://vuldb.com/?ctiid.351115Permissions Required, VDB Entry
https://vuldb.com/?id.351115Third Party Advisory, VDB Entry
https://vuldb.com/?submit.770401Third Party Advisory, VDB Entry
https://vuldb.com/?submit.770402Third Party Advisory, VDB Entry
https://vuldb.com/?submit.770403Third Party Advisory, VDB Entry
https://vuldb.com/?submit.770404Third Party Advisory, VDB Entry
https://vuldb.com/?submit.770405Third Party Advisory, VDB Entry
https://vuldb.com/?submit.770406Third Party Advisory, VDB Entry
https://vuldb.com/?submit.770407Third Party Advisory, VDB Entry
https://vuldb.com/?submit.770408Third Party Advisory, VDB Entry
https://www.dlink.com/Product

Timeline

Published: Mar 16, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-4203?

How severe is CVE-2026-4203?

CVE-2026-4203 has a CVSS score of 2.1/10 (LOW severity). The EPSS model estimates a 3.83% probability of exploitation in the next 30 days.

How do I fix CVE-2026-4203?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-4203?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST