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CVE-2026-3978— D-Link DIR-513 formEasySetupWizard3 stack-based overflow

Quick assessment

Affected
D-Link DIR-513
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 DIR-513是中国友讯（D-Link）公司的一款无线路由器产品。 D-Link DIR-513 1.10版本存在安全漏洞，该漏洞源于对文件/goform/formEasySetupWizard3中参数wan_connected的错误操作，可能导致栈缓冲区溢出。

CVSS 8.8 · High EPSS 0.71% · P51
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I. Basic Information for CVE-2026-3978

Vulnerability Information
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Vulnerability Title
D-Link DIR-513 formEasySetupWizard3 stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was detected in D-Link DIR-513 1.10. The impacted element is an unknown function of the file /goform/formEasySetupWizard3. The manipulation of the argument wan_connected results in stack-based buffer overflow. The attack can be launched remotely. The exploit is now 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 DIR-513 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
D-Link DIR-513是中国友讯（D-Link）公司的一款无线路由器产品。 D-Link DIR-513 1.10版本存在安全漏洞，该漏洞源于对文件/goform/formEasySetupWizard3中参数wan_connected的错误操作，可能导致栈缓冲区溢出。
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 DIR-513 1.10 -

II. Public POCs for CVE-2026-3978

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 128923 chars
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Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-3978

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Vendor Advisories for CVE-2026-3978 (1)

Proof of Concept for CVE-2026-3978 (1)

Vendor Pages for CVE-2026-3978 (1)

IV. Related Vulnerabilities

Same product: DIR-513
Same vendor: D-Link
Same weakness: CWE-121

V. Comments for CVE-2026-3978

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