CVE-2021-3304

Sagemcom F@ST 3686 v2 3.495 devices have a buffer overflow via a long sessionKey to the goform/login URI

published January 26, 2021

CVSS
—
EPSS
2%
Percentile
76.1
In the wild
Unconfirmed
What it is

⚠️ Watch out for the buffer overflow lurking in Sagemcom F@ST 3686 v2 devices! A long sessionKey sent to the goform/login URI could leave your device vulnerable. 🔥 Think of it like a filling that expands inside a cake — if you pack too much into the batter, it overflows and messes up the recipe. Here, the sessionKey is the overzealous filling, causing unwanted chaos in the device’s memory. If exploited, this buffer overflow can lead to unpredictable behavior, potentially allowing an attacker to execute arbitrary code. Imagine a cake that not only spills but also starts changing its ingredients mid-bake, leading to a catastrophic outcome!

Put simply

Think of it like a filling that expands inside a cake — if you pack too much into the batter, it overflows and messes up the recipe. Here, the sessionKey is the overzealous filling, causing unwanted chaos in the device’s memory. This vulnerability arises from a buffer overflow that occurs when a maliciously long sessionKey is sent to the login form at the goform URI, allowing for the possibility of arbitrary code execution.

What to do

If exploited, this buffer overflow can lead to unpredictable behavior, potentially allowing an attacker to execute arbitrary code. Imagine a cake that not only spills but also starts changing its ingredients mid-bake, leading to a catastrophic outcome! To safeguard your devices, ensure they are updated to the latest firmware, and avoid using overly long session keys. Consider monitoring logs for unusual activity as a precaution. You've got this! Stay vigilant, and with a few updates, you'll keep your devices safe and sound. 🛡️

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.01636 · 76.1th percentile
Published
2021-01-26T06:05Z
EPSS history
Timeline
  • 26 JAN 06:05Z
    Sagemcom F@ST 3686 v2 3.495 devices have a buffer overflow via a long sessionKey to the goform/login URI
    cvelistv5