Buffer Overflow Vulnerability in D-Link DI-8300 CGI Service
CVE-2026-91003

9.4CRITICAL

Key Information:

Vendor

D-link
Status
Di-8300
Vendor
CVE Published:
15 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-91003?

A security issue has been identified in the D-Link DI-8300 16.07, specifically within the CGI Service. The vulnerability resides in the function 'rzgl_asp' found in the '/rzgl.asp' file. An improper manipulation of the 'redirct_url' argument can trigger a stack-based buffer overflow. This flaw opens the door for potential remote exploitation, putting users at risk if left unaddressed. Relevant exploits have already been published, increasing the urgency for users to ensure their systems are secure.

Affected Version(s)

DI-8300 16.07

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-2026-91003 - Proof of Concept

References

https://vuldb.com/vuln/403586
vdb-entrytechnical-description
https://vuldb.com/vuln/403586/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-91003
third-party-advisory

CVSS V4

Score:
9.4
Severity:
CRITICAL
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

Xray (VulDB User)
.