Stack-Based Buffer Overflow in TOTOLINK A3300R Router by TOTOLINK
CVE-2025-12241

8.7HIGH

Key Information:

Vendor

Totolink
Status
A3300r
Vendor
CVE Published:
27 October 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-12241?

A stack-based buffer overflow vulnerability exists in the TOTOLINK A3300R router, specifically within the setLanguageCfg function of the /cgi-bin/cstecgi.cgi file. This vulnerability arises due to improper handling of the 'lang' POST parameter, allowing remote attackers to exploit the flaw. Given that the exploit is public, devices running the affected version are at risk of unauthorized access and potential system compromise.

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Affected Version(s)

A3300R 17.0.0cu.557_B20221024

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-2025-12241 - Proof of Concept

References

https://vuldb.com/?id.329911
vdb-entrytechnical-description
https://vuldb.com/?ctiid.329911
signaturepermissions-required
https://vuldb.com/?submit.673723
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

yhryhryhr_tu (VulDB User)
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