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High · 8.4 CVE-2019-25634 EUVD-2019-20008GHSA-cpr2-5chx-jmj3

Base64 Decoder 1.1.2 Local Buffer Overflow SEH Egghunter

Published Mar 24, 2026 · Updated Jul 15, 2026 · Assigned by VulnCheck

Description

Base64 Decoder 1.1.2 contains a stack-based buffer overflow vulnerability that allows local attackers to execute arbitrary code by triggering a structured exception handler (SEH) overwrite. Attackers can craft a malicious input file that overflows a buffer, overwrites the SEH chain with a POP-POP-RET gadget address, and uses an egghunter payload to locate and execute shellcode for code execution.

Affected products

VendorProductAffectedFixed
4Mhz Base64 Decoder 1.1.2 —

References