Stack-Based Buffer Overflow in D-Link DIR-645 Routers
CVE-2026-5815

8.7HIGH

Key Information:

Vendor

D-link
Status
Dir-645
Vendor
CVE Published:
8 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5815?

A security vulnerability in the D-Link DIR-645 router's hedwigcgi_main function, located in the hedwig.cgi file, leads to a stack-based buffer overflow. This flaw can be exploited remotely, allowing unauthorized users to manipulate the system. The problem predominantly affects versions 1.01, 1.02, and 1.03 of the DIR-645, which are no longer maintained by D-Link. Immediate action is advised to mitigate potential threats from publicly available exploits.

Affected Version(s)

DIR-645 1.01

DIR-645 1.02

DIR-645 1.03

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-2026-5815 - Proof of Concept

References

https://vuldb.com/vuln/356263
vdb-entrytechnical-description
https://vuldb.com/vuln/356263/cti
signaturepermissions-required
https://vuldb.com/submit/788298
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

Pers1st (VulDB User)
.