Stack-Based Buffer Overflow in D-Link DIR-816L Router
CVE-2025-13188

9.3CRITICAL

Key Information:

Vendor

D-link
Status
Dir-816l
Vendor
CVE Published:
14 November 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-13188?

A vulnerability exists in the D-Link DIR-816L router, specifically within the authentication.cgi script used for handling user authentication. The flaw is found in the authenticationcgi_main function, which is susceptible to a stack-based buffer overflow when the Password argument is manipulated. This oversight allows for potential remote exploitation, enabling unauthorized access to the affected device. It's crucial to note that this vulnerability affects devices that are no longer supported by D-Link, making them especially at risk for exploitation. Users of the DIR-816L router should take immediate action to mitigate potential security threats.

Affected Version(s)

DIR-816L 2_06_b09_beta

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-2025-13188 - Proof of Concept

References

https://vuldb.com/?id.332476
vdb-entrytechnical-description
https://vuldb.com/?ctiid.332476
signaturepermissions-required
https://vuldb.com/?submit.685538
third-party-advisory

CVSS V4

Score:
9.3
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

Lexpl0it (VulDB User)
JSON
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CVE-2025-13188 : Stack-Based Buffer Overflow in D-Link DIR-816L Router