Stack-Based Buffer Overflow in D-Link DIR-816 Router Firmware
CVE-2026-4181

9.3CRITICAL

Key Information:

Vendor

D-link
Status
Dir-816
Vendor
CVE Published:
15 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4181?

A security flaw has been identified in the D-Link DIR-816 1.10CNB05 router's firmware, specifically affecting the goahead component's /goform/form2RepeaterStep2.cgi file. This vulnerability enables an attacker to manipulate certain arguments such as key1, key2, key3, key4, and pskValue, potentially leading to a stack-based buffer overflow. The vulnerability can be exploited remotely, posing significant risks to the security of networked devices, particularly those that are no longer supported by D-Link. Organizations utilizing these routers should take immediate action to mitigate potential risks and consider upgrading to supported products.

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Affected Version(s)

DIR-816 1.10CNB05

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-2026-4181 - Proof of Concept

References

https://vuldb.com/?id.351085
vdb-entrytechnical-description
https://vuldb.com/?ctiid.351085
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https://vuldb.com/?submit.769829
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

pjqwudi (VulDB User)
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