Stack-based Buffer Overflow in TOTOLINK A3300R Router
CVE-2025-12259

8.7HIGH

Key Information:

Vendor

Totolink
Status
A3300r
Vendor
CVE Published:
27 October 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-12259?

A vulnerability exists in the TOTOLINK A3300R router within the setScheduleCfg function found in the /cgi-bin/cstecgi.cgi file. The flaw is triggered by an improper handling of the recHour parameter, which leads to a stack-based buffer overflow. This oversight allows attackers to execute a remote exploit, potentially compromising the device's security. The exploit has been publicly documented and poses a risk to users running the affected firmware version.

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-2025-12259 - Proof of Concept

References

https://vuldb.com/?id.329930
vdb-entrytechnical-description
https://vuldb.com/?ctiid.329930
signaturepermissions-required
https://vuldb.com/?submit.673726
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_ (VulDB User)
JSON
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CVE-2025-12259 : Stack-based Buffer Overflow in TOTOLINK A3300R Router