How severe is CVE-2026-4204?

CVE-2026-4204 has a CVSS 2.0 base score of 6.5 (MEDIUM). EPSS estimates a 5.5% probability of exploitation in the next 30 days.

CVE-2026-4204: D-Link DNS-1550-04 gui

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. The affected element is the function cgi_myfavorite_add/cgi_myfavorite_set/cgi_myfavorite_del/cgi_myfavorite_set_sort_info/cgi_myfavorite_remove_apkg/cgi_myfavorite_compare_apkg/cgi_mycloud_auto_downlaod of the file /cgi-bin/gui_mgr.cgi. This manipulation of the argument f_user causes command injection. Remote exploitation of the attack is possible. The exploit has been published and may be used.

Severity

CVSS 4.0 · CNA5.3 MEDIUM

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

CVSS 3.1 · CNA6.3 MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

CVSS 3.0 · CNA6.3 MEDIUM

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

CVSS 2.0 · CNA6.5 MEDIUM

AV:N/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:UR

SSVC · CISA-ADP

Exploitationpoc

Automatableno

Technical impacttotal

Exploitation Context

as of October 13, 2026

All KEV statistics→

Its current EPSS score (5.5%) is higher than that of 19% of CISA KEV entries.

Affected Products

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

References

5 Links

Exploits & PoCs

https://github.com/wudipjq/my_vuln/blob/main/D-Link8/vuln_130/130.md

Third-party advisories

Submit #770409 | D-Link DNS-120/202L/315L/320/320L/320LW/321/322L/323/325/326/327L/326/340L/343/345/726-4/1100-4/1200-05/1550-04 up to 20260205 Command Injection

Technical writeups

VDB-351116 | D-Link DNS-1550-04 gui_mgr.cgi cgi_mycloud_auto_downlaod command injection

Detection signatures

VDB-351116 | CTI Indicators (IOB, IOC, TTP, IOA)

Product pages

https://www.dlink.com/

Record Details

Published

2026-03-16

Last updated

2026-03-16

Assigner (CNA)

VulDB

Credited to

Bond (VulDB User)

More from D-Link

All D-Link CVEs→

CVE-2026-41976.5 MEDIUM

D-Link DNS-1550-04 download_mgr.cgi RSS_Item_List command injection

D-LinkEPSS 24.5%2026-03-15

CVE-2026-42036.5 MEDIUM

D-Link DNS-1550-04 network_mgr.cgi cgi_dhcpd command injection

D-LinkEPSS 6.1%2026-03-16

CVE-2026-41966.5 MEDIUM

D-Link DNS-1550-04 remote_backup.cgi cgi_set_rsync_server command injection

D-LinkEPSS 6.0%2026-03-15

CVE-2026-42096.5 MEDIUM

D-Link DNS-1550-04 account_mgr.cgi cgi_chg_admin_pw command injection

D-LinkEPSS 5.8%2026-03-16

Tool categories

Application Security Tools Penetration Testing Tools

CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.

CVE-2026-4204