CVE-2019-25634 HIGH

CVE-2019-25634: Base64 Decoder 1.1.2 Local Buffer Overflow SEH Egghunter

Vendor 4Mhz
Product Base64 Decoder
Weakness CWE-787
Published March 24, 2026
Last update March 24, 2026

CVSS base score

8.6/10
Attack vector Local
Attack complexity Low
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 24, 2026 CVE published
March 24, 2026 Record updated