Stack-Based Buffer Overflow in X2000R by TOTOLINK
CVE-2026-9659

9.1CRITICAL

Key Information:

Vendor

Totolink
Status
Totolink
Vendor
CVE Published:
20 October 2026

What is CVE-2026-9659?

Multiple stack-based buffer overflow vulnerabilities exist within the boa formFilter functionality of the TOTOLINK X2000R router. An attacker can exploit these vulnerabilities by sending specially crafted HTTP requests, which can lead to arbitrary code execution. The vulnerabilities specifically target the vpnUser parameter, allowing authenticated users to trigger the exploit. It is crucial for users of the affected product to implement security measures to mitigate 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
.