Stack-Based Buffer Overflow in Totolink Router
CVE-2026-42021

9.1CRITICAL

Key Information:

Vendor

Totolink
Status
Totolink
Vendor
CVE Published:
20 October 2026

What is CVE-2026-42021?

Multiple stack-based buffer overflow vulnerabilities have been identified in the static network configuration functionality of the Totolink X2000R router. Specifically, these vulnerabilities arise from improper handling of the static_dns1 parameter during HTTP requests. An attacker with authenticated access may exploit these weaknesses by sending specially crafted HTTP requests, which can lead to arbitrary code execution and compromise the integrity of the device. Ensuring proper input validation and patching affected versions is crucial to mitigating these risks.

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
.