CVE-2012-10021CWE-121

D-Link DIR-605L Captcha Handling Buffer Overflow

Critical · published July 31, 2025

CVSS v4.0
9.3
EPSS
5%
Percentile
91.9
In the wild
Unconfirmed
What it is

🚨 A sneaky buffer overflow in D-Link DIR-605L routers could have an attacker executing arbitrary code remotely! 🔥 Think of it like a chef using a recipe that calls for a precise amount of an ingredient. If they mix too much, the dish overflows and messes up the entire kitchen—this flaw lets attackers overflow the stack and take control of the router! An attacker could potentially seize control of the router, executing any command they desire, which means they could redirect traffic, steal sensitive data, or even launch attacks on other devices on your network. This is absolutely devastating for your home or business security!

Put simply

Think of it like a chef using a recipe that calls for a precise amount of an ingredient. If they mix too much, the dish overflows and messes up the entire kitchen—this flaw lets attackers overflow the stack and take control of the router! The vulnerability in the D-Link DIR-605L firmware stems from the unsafe usage of the sprintf() function when processing user-supplied CAPTCHA data, allowing remote unauthenticated attackers to exploit it and gain root privileges.

What to do

An attacker could potentially seize control of the router, executing any command they desire, which means they could redirect traffic, steal sensitive data, or even launch attacks on other devices on your network. This is absolutely devastating for your home or business security! Immediate action is crucial: upgrade your router firmware to the latest version that addresses this vulnerability, which is version 1.14 or later. Additionally, consider disabling remote management features to further protect your device. You've got this! By following these steps, you'll be well on your way to securing your router and keeping your network safe! 🛡️

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
EPSS
0.04787 · 91.9th percentile
Weakness
CWE-121 · Stack-based Buffer Overflow
Published
2025-07-31T14:54Z
EPSS history
Timeline
  • 31 JUL 14:54Z
    D-Link DIR-605L Captcha Handling Buffer Overflow
    cvelistv5