Buffer Overflow Vulnerability in D-Link DIR-632 Router
CVE-2025-6121

9.3CRITICAL

Key Information:

Vendor

D-link
Status
Dir-632
Vendor
CVE Published:
16 June 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-6121?

A significant security issue has been identified in the D-Link DIR-632 router. This vulnerability resides in the HTTP POST Request Handler, specifically within the get_pure_content function. An attacker can exploit this vulnerability remotely by manipulating the Content-Length argument, which may lead to a stack-based buffer overflow. As a result, unauthorized users could potentially execute arbitrary code on devices running the affected firmware. Additionally, it is important to note that this vulnerability impacts products that are no longer supported by D-Link, rendering them particularly susceptible to attacks.

Affected Version(s)

DIR-632 FW103B08

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-2025-6121 - Proof of Concept

References

https://vuldb.com/?id.312590
vdb-entrytechnical-description
https://vuldb.com/?ctiid.312590
signaturepermissions-required
https://vuldb.com/?submit.592574
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

xiaobor123 (VulDB User)
.
CVE-2025-6121 : Buffer Overflow Vulnerability in D-Link DIR-632 Router