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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| INSTAR | 2K+ | 3.11.1 Build 1124 | — |
| INSTAR | 4K | 3.11.1 Build 1124 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
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born0monday/CVE-2025-8760 ★ 4 · Oct 30, 2025
Proof of Concept for CVE-2025-8760
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- VDB-319863 | INSTAR 2K+/4K fcgi_server base64_decode buffer overflow vdb-entry technical-description
- VDB-319863 | CTI Indicators (IOB, IOC, IOA) signature permissions-required
- https://modzero.com/static/MZ-25-03_modzero_INSTAR.pdf related