CVE-2025-8760

INSTAR 2K+/4K fcgi_server base64_decode buffer overflow

CRITICAL 9.3EPSS 0.8%

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: INSTAR · 2K+ · 4K
CVSS v4.0 VULDB: 9.3 CRITICALCVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1 VULDB: 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v2.0 VULDB: 10.0 HIGHAV:N/AC:L/Au:N/C:C/I:C/A:C
EPSS: 0.82% chance of exploitation in the next 30 days, 57th percentile
Published: 2025-08-13

Proof-of-concept exploits (1)

born0monday/CVE-2025-87604★ · 2025-10-30

References

CVE Record
NVD entry

CVE-2025-8760

Proof-of-concept exploits (1)

References

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