CVE-2025-15255CWE-119CWE-121

Tenda W6-S R7websSsecurityHandler httpd stack-based overflow

Critical · published December 30, 2025

CVSS v4.0
9.3
EPSS
5%
Percentile
91.7
In the wild
Unconfirmed
What it is

🚨 A crafty manipulation of the Cookie argument is a recipe for disaster in Tenda W6-S! This stack-based buffer overflow could grant attackers remote access - no special tools required! 🔥 Think of it like a waiter who accidentally spills hot soup on your lap because they didn’t check the order properly before serving. In this case, the server mismanages what’s in the Cookie, leading to a disastrous overflow of data! An attacker could exploit this vulnerability to execute arbitrary code on the affected system, potentially taking full control of the device. Imagine giving a stranger the keys to your home—everything from your data to your network could be at risk!

Put simply

Think of it like a waiter who accidentally spills hot soup on your lap because they didn’t check the order properly before serving. In this case, the server mismanages what’s in the Cookie, leading to a disastrous overflow of data! This vulnerability in the Tenda W6-S occurs within the '/bin/httpd' file, where improper handling of the Cookie argument leads to a stack-based buffer overflow, allowing attackers to control execution flow.

What to do

An attacker could exploit this vulnerability to execute arbitrary code on the affected system, potentially taking full control of the device. Imagine giving a stranger the keys to your home—everything from your data to your network could be at risk! Update your device firmware to version 1.0.0.5 immediately to patch this vulnerability. Additionally, consider reviewing and hardening your router's security settings to prevent unauthorized access. Don't forget to regularly check for updates! You've got this! By taking action now, you can lock down your network and keep those cyber intruders at bay! 🛡️

The record
Technical detail
CVSS v4.0
9.3 · CRITICAL
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
EPSS
0.04652 · 91.7th percentile
Weaknesses
CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer; CWE-121 · Stack-based Buffer Overflow
Published
2025-12-30T16:02Z
EPSS history
Timeline
  • 30 DEC 16:02Z
    Tenda W6-S R7websSsecurityHandler httpd stack-based overflow
    cvelistv5