CVE-2021-35395KEV · OVERDUE

Realtek AP-Router SDK Buffer Overflow Vulnerability

Critical · published August 16, 2021

Patch now

Confirmed exploited, and the score agrees

CVSS calls it critical at 9.8. It is confirmed in active exploitation. It sits in the 99.9th percentile for exploit probability.

1803
days past CISA
deadline
CVSS v3.1
9.8
EPSS
98%
Percentile
99.9
In the wild
Confirmed
What it is

🚨 A stack buffer overflow in Realtek Jungle SDK could let attackers execute arbitrary commands on your device — think of this as a very unwelcome guest being handed the keys to your server! 🔥 Picture a restaurant where the chef accidentally trusts a diner’s special request without double-checking it — they could end up serving something hazardous to everyone in the kitchen! If exploited, attackers could gain remote control over the device, potentially leading to devastating consequences like data theft, unauthorized access, or even taking over critical infrastructure. This is not just a minor inconvenience; it opens the floodgates for extensive damage!

Put simply

Picture a restaurant where the chef accidentally trusts a diner’s special request without double-checking it — they could end up serving something hazardous to everyone in the kitchen! Several stack buffer overflows exist in Realtek Jungle SDK (versions v2.x up to v3.4.14B) due to unsafe copying of parameters in various management forms, allowing attackers to execute arbitrary commands or inject malicious code.

What to do

If exploited, attackers could gain remote control over the device, potentially leading to devastating consequences like data theft, unauthorized access, or even taking over critical infrastructure. This is not just a minor inconvenience; it opens the floodgates for extensive damage! Review and patch your devices to a secure version of the SDK, and consider implementing stricter input validation for form submissions. Additionally, if using a customized version, assess any modifications that may introduce new vulnerabilities. You've got this! Follow these steps to secure your devices and maintain your security hero status! 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.98100 · 99.9th percentile
Published
2021-08-16T11:07Z
KEV added
2021-11-03 · due 2021-11-17
EPSS history
Timeline
  • 03 NOV 00:00Z
    Added to CISA KEV — remediate by Nov 17
    kev
  • 16 AUG 11:07Z
    Realtek Jungle SDK version v2.x up to v3.4.14B provides an HTTP web server exposing a management interface that can be used to configure the access point
    cvelistv5