Stack-Based Buffer Overflow in D-Link DIR-513 Router
CVE-2026-3978

8.7HIGH

Key Information:

Vendor

D-link
Status
Dir-513
Vendor
CVE Published:
12 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3978?

A stack-based buffer overflow vulnerability has been identified in the D-Link DIR-513 router version 1.10, specifically within the formEasySetupWizard3 functionality. This vulnerability allows an attacker to manipulate the wan_connected argument, enabling remote exploitation. The risk escalates as the exploit is publicly available, which can facilitate unauthorized access and impact the device's security. Users are urged to secure their devices and monitor for any malicious activities.

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Affected Version(s)

DIR-513 1.10

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-3978 - Proof of Concept

References

https://vuldb.com/?id.350413
vdb-entrytechnical-description
https://vuldb.com/?ctiid.350413
signaturepermissions-required
https://vuldb.com/?submit.769586
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

LtzHust2 (VulDB User)
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