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CVE-2026-4205— D-Link DNS-1550-04 app_mgr.cgi FTP_Server_BlockIP_Del command injection

Quick assessment

Affected
D-Link DNS-120
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

D-Link DNS-320等都是中国友讯（D-Link）公司的产品。D-Link DNS-320是一款NAS（网络附属存储）设备。D-Link DNS-325是一款NAS（网络附属存储）设备。D-Link DNS-120是一个网络存储适配器。 D-Link多款产品存在命令注入漏洞，该漏洞源于对文件/cgi-bin/app_mgr.cgi中函数cgi_refresh_db/FTP_Server_BlockIP_Add/FTP_Server_BlockIP_Del的错误操作，可能导致命令注入。以下产品及版本

CVSS 6.3 · Medium EPSS 5.09% · P92
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I. Basic Information for CVE-2026-4205

Vulnerability Information
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Vulnerability Title
D-Link DNS-1550-04 app_mgr.cgi FTP_Server_BlockIP_Del command injection
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability 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 impacted element is the function cgi_refresh_db/FTP_Server_BlockIP_Add/FTP_Server_BlockIP_Del of the file /cgi-bin/app_mgr.cgi. Such manipulation leads to command injection. The attack can be executed remotely. The exploit has been disclosed to the public and may be used.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在命令中使用的特殊元素转义处理不恰当(命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
D-Link多款产品 命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
D-Link DNS-320等都是中国友讯（D-Link）公司的产品。D-Link DNS-320是一款NAS（网络附属存储）设备。D-Link DNS-325是一款NAS（网络附属存储）设备。D-Link DNS-120是一个网络存储适配器。 D-Link多款产品存在命令注入漏洞，该漏洞源于对文件/cgi-bin/app_mgr.cgi中函数cgi_refresh_db/FTP_Server_BlockIP_Add/FTP_Server_BlockIP_Del的错误操作，可能导致命令注入。以下产品及版本
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
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 -

II. Public POCs for CVE-2026-4205

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III. Intelligence Information for CVE-2026-4205

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Vendor Advisories for CVE-2026-4205 (4)

Proof of Concept for CVE-2026-4205 (1)

News Coverage for CVE-2026-4205 (1)

Vendor Pages for CVE-2026-4205 (1)

Same Patch Batch · D-Link · 2026-03-16 · 11 CVEs total

CVE-2026-4214 8.8 HIGH D-Link DNS-1550-04 app_mgr.cgi UPnP_AV_Server_Path_Setting stack-based overflow
CVE-2026-4213 8.8 HIGH D-Link DNS-1550-04 gui_mgr.cgi cgi_myfavorite_verify stack-based overflow
CVE-2026-4212 8.8 HIGH D-Link DNS-1550-04 download_mgr.cgi Downloads_Schedule_Info stack-based overflow
CVE-2026-4211 8.8 HIGH D-Link DNS-1550-04 local_backup_mgr.cgi Local_Backup_Info stack-based overflow
CVE-2026-4210 6.3 MEDIUM D-Link DNS-1550-04 time_machine.cgi cgi_tm_set_share command injection
CVE-2026-4209 6.3 MEDIUM D-Link DNS-1550-04 account_mgr.cgi cgi_chg_admin_pw command injection
CVE-2026-4207 6.3 MEDIUM D-Link DNS-1550-04 system_mgr.cgi cgi_ntp_time command injection
CVE-2026-4206 6.3 MEDIUM D-Link DNS-1550-04 dsk_mgr.cgi ScanDisk_run_e2fsck command injection
CVE-2026-4204 6.3 MEDIUM D-Link DNS-1550-04 gui_mgr.cgi cgi_mycloud_auto_downlaod command injection
CVE-2026-4203 6.3 MEDIUM D-Link DNS-1550-04 network_mgr.cgi cgi_dhcpd command injection

IV. Related Vulnerabilities

Same product: DNS-120
Same vendor: D-Link
Same weakness: CWE-77

V. Comments for CVE-2026-4205

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