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CVE-2025-7911— D-Link DI-8100 jhttpd upnp_ctrl.asp sprintf stack-based overflow

Quick assessment

Affected
D-Link DI-8100
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

D-Link DI-8100是中国友讯（D-Link）公司的一款专为中小型网络环境设计的无线宽带路由器。 D-Link DI-8100 1.0版本存在安全漏洞，该漏洞源于对文件/upnp_ctrl.asp中参数remove_ext_proto/remove_ext_port的错误操作导致栈缓冲区溢出。

CVSS 8.8 · High EPSS 1.38% · P70
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I. Basic Information for CVE-2025-7911

Vulnerability Information
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Vulnerability Title
D-Link DI-8100 jhttpd upnp_ctrl.asp sprintf stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability classified as critical was found in D-Link DI-8100 1.0. This vulnerability affects the function sprintf of the file /upnp_ctrl.asp of the component jhttpd. The manipulation of the argument remove_ext_proto/remove_ext_port leads to stack-based buffer overflow. The attack can be initiated 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 DI-8100 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
D-Link DI-8100是中国友讯（D-Link）公司的一款专为中小型网络环境设计的无线宽带路由器。 D-Link DI-8100 1.0版本存在安全漏洞，该漏洞源于对文件/upnp_ctrl.asp中参数remove_ext_proto/remove_ext_port的错误操作导致栈缓冲区溢出。
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 DI-8100 1.0 -

II. Public POCs for CVE-2025-7911

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8865 chars
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III. Intelligence Information for CVE-2025-7911

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Vendor Pages for CVE-2025-7911 (1)

Other References for CVE-2025-7911 (1)

Same Patch Batch · D-Link · 2025-07-20 · 4 CVEs total

CVE-2025-7910 8.8 HIGH D-Link DIR-513 Boa Webserver formSetWanNonLogin sprintf stack-based overflow
CVE-2025-7909 8.8 HIGH D-Link DIR-513 Boa Webserver formLanSetupRouterSettings sprintf stack-based overflow
CVE-2025-7908 8.8 HIGH D-Link DI-8100 jhttpd ddns.asp sprintf stack-based overflow

IV. Related Vulnerabilities

Same product: DI-8100
Same vendor: D-Link
Same weakness: CWE-121

V. Comments for CVE-2025-7911

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