Stack-Based Buffer Overflow Vulnerability in D-Link DIR-816 Router
CVE-2025-5623

9.3CRITICAL

Key Information:

Vendor

D-link
Status
Dir-816
Vendor
CVE Published:
5 June 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-5623?

A vulnerability has been identified in the D-Link DIR-816 router, particularly in the qosClassifier function located in the /goform/qosClassifier file. This issue arises when manipulating the dip_address and sip_address arguments, leading to a stack-based buffer overflow. The flaw is particularly concerning as it can be exploited remotely, posing significant risks to users of outdated versions of this product. Due to the nature of the vulnerability and its public disclosure, it is imperative for users to be aware and take necessary precautions to mitigate against potential exploitation.

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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-2025-5623 - Proof of Concept

References

https://vuldb.com/?id.311109
vdb-entrytechnical-description
https://vuldb.com/?ctiid.311109
signaturepermissions-required
https://vuldb.com/?submit.589224
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

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