CVE-2026-1143CWE-119CWE-120

TOTOLINK A3700R cstecgi.cgi setWiFiEasyGuestCfg buffer overflow

High · published January 19, 2026

CVSS v4.0
8.7
EPSS
1%
Percentile
54.9
In the wild
Unconfirmed
What it is

⚡ A remote attacker could trigger a buffer overflow with a mere manipulation of the SSID in your TOTOLINK A3700R — that’s right, just a crafty Wi-Fi name could bring chaos! 🔥 Think of this like a fast-food restaurant where a customer can slip a prank note into their order, causing the kitchen to misfire and serve something completely unexpected. If the order’s not double-checked, it could lead to disastrous results! An attacker could exploit this vulnerability to execute arbitrary code on your device, potentially taking complete control over it! This means they could snoop on your network traffic, tamper with settings, or even use your device as a launchpad for further attacks. Absolutely devastating!

Put simply

Think of this like a fast-food restaurant where a customer can slip a prank note into their order, causing the kitchen to misfire and serve something completely unexpected. If the order’s not double-checked, it could lead to disastrous results! This vulnerability arises in the setWiFiEasyGuestCfg function of the /cgi-bin/cstecgi.cgi file, where manipulating the 'ssid' argument leads to a buffer overflow, allowing for remote code execution without authentication.

What to do

An attacker could exploit this vulnerability to execute arbitrary code on your device, potentially taking complete control over it! This means they could snoop on your network traffic, tamper with settings, or even use your device as a launchpad for further attacks. Absolutely devastating! To protect yourself, immediately update your TOTOLINK A3700R to the latest firmware version that addresses this vulnerability. Additionally, consider implementing strict input validation to safeguard against unexpected input in the future. Don't delay! You've got this! Follow these steps, and your network will be fortified in no time! 🛡️

The record
Technical detail
CVSS v4.0
8.7 · HIGH
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
EPSS
0.00762 · 54.9th percentile
Weaknesses
CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer; CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Published
2026-01-19T07:02Z
EPSS history
Timeline
  • 19 JAN 07:02Z
    TOTOLINK A3700R cstecgi.cgi setWiFiEasyGuestCfg buffer overflow
    cvelistv5