Stack-Based Buffer Overflow in Totolink X2000R Product
CVE-2026-42020

9.1CRITICAL

Key Information:

Vendor

Totolink
Status
Totolink
Vendor
CVE Published:
20 October 2026

What is CVE-2026-42020?

In the Totolink X2000R router's pppoe functionality, multiple stack-based buffer overflow vulnerabilities can be exploited by sending specially crafted HTTP requests. These requests target the pppoe_dns2 parameter, allowing attackers to execute arbitrary code upon successful authentication. This vulnerability poses significant risks to network security, emphasizing the need for immediate remediation to protect affected devices.

Affected Version(s)

Totolink TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327

References

https://talosintelligence.com/vulnerability_reports/TALOS...

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Discovered by Lilith Wyatt of Cisco Talos
.