CVE-2026-4211— D-Link DNS-1550-04 local_backup_mgr.cgi Local_Backup_Info stack-based overflow
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I. Basic Information for CVE-2026-4211
Vulnerability Information
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Vulnerability Title
D-Link DNS-1550-04 local_backup_mgr.cgi Local_Backup_Info stack-based overflow
Source: NVD (National Vulnerability Database)
Vulnerability Description
A weakness has been identified 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. Affected by this issue is the function Local_Backup_Info of the file /cgi-bin/local_backup_mgr.cgi. This manipulation of the argument f_idx causes stack-based buffer overflow. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
栈缓冲区溢出
Source: NVD (National Vulnerability Database)
Vulnerability Title
D-Link多款产品 安全漏洞
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多款产品存在安全漏洞，该漏洞源于对文件/cgi-bin/local_backup_mgr.cgi中函数Local_Backup_Info的参数f_idx的操作，可能导致栈缓冲区溢出。以下产品及版本受到影响：DNS-120、DNR-202L、DNS-31
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-2026-4211
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCVerified env Premium
Qwen3.6-35B-A3B · 10474 chars
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III. Intelligence Information for CVE-2026-4211
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PoC · 1Advisory · 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-2026-4210 | 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-2026-4205 | 6.3 MEDIUM | D-Link DNS-1550-04 app_mgr.cgi FTP_Server_BlockIP_Del 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
- CVE-2026-5312
D-Link DNS-1550-04 dsk_mgr.cgi Get_current_raidtype access c - CVE-2026-5311
D-Link DNS-1550-04 file_center.cgi Webdav_Access_List access - CVE-2026-5215
D-Link DNS-1550-04 network_mgr.cgi cgi_get_ipv6 access contr - CVE-2026-5214
D-Link DNS-1550-04 account_mgr.cgi cgi_addgroup_get_group_qu - CVE-2026-5213
D-Link DNS-1550-04 account_mgr.cgi cgi_adduser_to_session st
Same vendor: D-Link
- CVE-2026-8346
D-Link DIR-816 portForward command injection - CVE-2026-8345
D-Link DIR-816 singlePortForward sub_445E7C command injectio - CVE-2026-8344
D-Link DIR-816 formDMZ.cgi sub_445E7C command injection - CVE-2026-8273
D-Link DNS-320 system_mgr.cgi cgi_merge_user os command inje - CVE-2026-8272
D-Link DNS-320 webfile_mgr.cgi chown os command injection
Same weakness: CWE-121
- CVE-2026-39461
select(2) file descriptor set overflow causes stack overflow - CVE-2026-45250
Stack buffer overflow via setcred(2) - CVE-2026-44056
Stack buffer overflow in desktop.c - CVE-2026-44048
Stack buffer overflow via UCS-2 type confusion in convert_ch - CVE-2026-9150
Libsolv: stack-based buffer overflow in libsolv's debian met
V. Comments for CVE-2026-4211
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