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CVE-2025-8760 PoC — INSTAR 2K+/4K fcgi_server base64_decode buffer overflow

Source
https://github.com/born0monday/CVE-2025-8760
Associated Vulnerability
Title:INSTAR 2K+/4K fcgi_server base64_decode buffer overflow (CVE-2025-8760)
Description:A vulnerability was identified in INSTAR 2K+ and 4K 3.11.1 Build 1124. This affects the function base64_decode of the component fcgi_server. The manipulation of the argument Authorization leads to buffer overflow. It is possible to initiate the attack remotely.
Description
Proof of Concept for CVE-2025-8760
Readme
# Proof of Concept for CVE-2025-8760

Detailed write-up is available [here](https://modzero.com/en/blog/no-leak-no-problem/).
File Snapshot

 [4.0K]  /data/pocs/bb396a0c74dd6aa043daa804bda9669b28c6fe23
├── [2.6K]  exploit.py
└── [ 128]  README.md

1 directory, 2 files
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