HTTP POST Request Handler Buffer Overflow in TOTOLINK Routers
CVE-2025-6393

8.7HIGH

Key Information:

Vendor

Totolink
Status
A702r
A3002r
A3002ru
Ex1200t
Vendor
CVE Published:
21 June 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-6393?

A vulnerability has been identified in various TOTOLINK router models due to an issue in the HTTP POST Request Handler. Specifically, the function handling IPv6 address submissions is flawed, allowing remote attackers to manipulate the 'submit-url' argument, which results in a buffer overflow condition. This may lead to unauthorized access or exploitation of the device, compromising its integrity and security. Users of affected models should take immediate action to secure their devices against potential exploitation.

Affected Version(s)

A3002R 3.0.0-B20230809.1615

A3002R 4.0.0-B20230531.1404

A3002R 4.0.0-B20230721.1521

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-2025-6393 - Proof of Concept

References

https://vuldb.com/?id.313386
vdb-entrytechnical-description
https://vuldb.com/?ctiid.313386
signaturepermissions-required
https://vuldb.com/?submit.597565
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
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

YeLeipeng_ (VulDB User)
.
CVE-2025-6393 : HTTP POST Request Handler Buffer Overflow in TOTOLINK Routers