CVE-2025-8760CWE-119CWE-120

INSTAR 2K+/4K fcgi_server base64_decode buffer overflow

Critical · published August 13, 2025

CVSS v4.0
9.3
EPSS
1%
Percentile
56.9
In the wild
Unconfirmed
What it is

🚨 A remote attacker can trigger a buffer overflow in INSTAR 2K+ and 4K 3.11.1 with a crafty Authorization tweak — not what you’d expect from your security system! 🔥 Think of it like a guest at a hotel who manages to sneak an oversized suitcase through a security checkpoint, causing the entire system to jam and potentially spill secrets everywhere. This vulnerability allows attackers to exploit a flaw in how data is processed, like a clerk accepting a poorly labeled package without checking its contents. An attacker could manipulate the Authorization argument and trigger a buffer overflow, potentially allowing unauthorized access to sensitive data or full system control. Imagine the chaos if your security system was compromised — data leaks, unauthorized surveillance, or worse could ensue!

Put simply

Think of it like a guest at a hotel who manages to sneak an oversized suitcase through a security checkpoint, causing the entire system to jam and potentially spill secrets everywhere. This vulnerability allows attackers to exploit a flaw in how data is processed, like a clerk accepting a poorly labeled package without checking its contents. This buffer overflow vulnerability in the base64_decode function of the fcgi_server component allows for the manipulation of input arguments, resulting in the potential execution of arbitrary code remotely.

What to do

An attacker could manipulate the Authorization argument and trigger a buffer overflow, potentially allowing unauthorized access to sensitive data or full system control. Imagine the chaos if your security system was compromised — data leaks, unauthorized surveillance, or worse could ensue! Immediately update to the latest version of INSTAR to patch this vulnerability. Review your configurations and ensure that proper input validation is in place to handle unexpected data. Don't forget to monitor your server logs for any suspicious activity! You've got this! Stay vigilant and secure your system with these updates! 🛡️

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:X
EPSS
0.00823 · 56.9th 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
2025-08-13T06:14Z
EPSS history
Timeline
  • 13 AUG 06:14Z
    INSTAR 2K+/4K fcgi_server base64_decode buffer overflow
    cvelistv5