Stack-Based Buffer Overflow in TOTOLINK A800R Firewall Component
CVE-2026-19815

8.7HIGH

Key Information:

Vendor

Totolink
Status
A800r
Vendor
CVE Published:
14 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-19815?

A critical flaw has been identified in the TOTOLINK A800R firmware version 4.1.2cu.5137_B20200730, specifically within the setParentalRules function of the firewall component (file: /cgi-bin/cstecgi.cgi). This vulnerability allows for a stack-based buffer overflow that can be triggered by manipulating the urlKeyword parameter, enabling remote attackers to execute arbitrary code. The published exploit poses a significant threat, making it crucial for users to address this issue promptly.

Affected Version(s)

A800R 4.1.2cu.5137_B20200730

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-2026-19815 - Proof of Concept

References

https://vuldb.com/vuln/389951
vdb-entrytechnical-description
https://vuldb.com/vuln/389951/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-19815
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

panda_0x1 (VulDB User)
.