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CVE-2026-5212— D-Link DNS-1550-04 webdav_mgr.cgi Webdav_Upload_File stack-based overflow

Quick assessment

Affected
D-Link DNS-120
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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-327L等都是中国友讯（D-Link）公司的产品。D-Link DNS-327L是一款NAS（网络附属存储）设备。D-Link DNS-340L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/webdav_mgr.cgi中参数f_file的错误操作导致栈缓冲区溢出。以下产品和版本受到影响：DNS-120 20260205及之前版本、DNR-202L 20260205及之前版本、D

CVSS 8.8 · High EPSS 1.16% · P66

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-5212

Vulnerability Information
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Vulnerability Title
D-Link DNS-1550-04 webdav_mgr.cgi Webdav_Upload_File stack-based overflow
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. This issue affects the function Webdav_Upload_File of the file /cgi-bin/webdav_mgr.cgi. The manipulation of the argument f_file leads to stack-based buffer overflow. The attack is possible to be carried out 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:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
D-Link多款产品 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
D-Link DNS-327L等都是中国友讯（D-Link）公司的产品。D-Link DNS-327L是一款NAS（网络附属存储）设备。D-Link DNS-340L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/webdav_mgr.cgi中参数f_file的错误操作导致栈缓冲区溢出。以下产品和版本受到影响：DNS-120 20260205及之前版本、DNR-202L 20260205及之前版本、D
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-2026-5212

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III. Intelligence Information for CVE-2026-5212

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Security Blog Posts for CVE-2026-5212 (1)

Vendor Pages for CVE-2026-5212 (1)

Same Patch Batch · D-Link · 2026-03-31 · 5 CVEs total

CVE-2026-5211 8.8 HIGH D-Link DNS-1550-04 app_mgr.cgi UPnP_AV_Server_Path_Del stack-based overflow
CVE-2026-5213 8.8 HIGH D-Link DNS-1550-04 account_mgr.cgi cgi_adduser_to_session stack-based overflow
CVE-2026-5214 8.8 HIGH D-Link DNS-1550-04 account_mgr.cgi cgi_addgroup_get_group_quota_minsize stack-based overfl
CVE-2026-5215 4.3 MEDIUM D-Link DNS-1550-04 network_mgr.cgi cgi_get_ipv6 access control

IV. Related Vulnerabilities

Same product: DNS-120
Same vendor: D-Link
Same weakness: CWE-121

V. Comments for CVE-2026-5212

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