Buffer overflow in Totolink

CVE-2026-9869

A stack-based buffer overflow vulnerability exists in the boa formTR069Config functionality of X2000R (version(s): TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327). A specially crafted HTTP request can lead to arbitrary code execution. An attacker can make an authenticated HTTP request to trigger this vulnerability.

Vulnerability class: Buffer Overflow

Published .

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

  • Totolink — versions TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-9869?
CVE-2026-9869 is a critical-severity vulnerability in Totolink, classified under Stack-based Buffer Overflow. CVSS score: 9.1/10. Published 2026-10-20.
How severe is CVE-2026-9869?
Critical severity. CVSS v3 base score is 9.1 out of 10.