Stack-Based Buffer Overflow in D-Link DIR-600L HNAP Handler
CVE-2026-129354

10CRITICAL

Key Information:

Vendor

D-link
Status
Dir-600l
Vendor
CVE Published:
15 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-129354?

A vulnerability has been identified in the D-Link DIR-600L router's HNAP Handler, specifically in the hnap_main function located in the cgibin directory. This flaw allows an attacker to execute a remote stack-based buffer overflow attack, leading to potential unauthorized access and control over the device. The exploit has been publicly disclosed, raising concerns about the security of affected devices. Users are advised to implement necessary security measures to mitigate the risks associated with this vulnerability.

Affected Version(s)

DIR-600L 2.17b02

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-2026-129354 - Proof of Concept

References

https://vuldb.com/vuln/437417
vdb-entrytechnical-description
https://vuldb.com/vuln/437417/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-129354
third-party-advisory

CVSS V4

Score:
10
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

ruanyi (VulDB User)
.