What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-08-13 · updated 2026-06-17
• Weakness: CWE-119

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

• INSTAR 2K+: 3.11.1 Build 1124
• INSTAR 4K: 3.11.1 Build 1124

References

• https://modzero.com/static/MZ-25-03_modzero_INSTAR.pdf
• https://vuldb.com/?ctiid.319863
• https://vuldb.com/?id.319863

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