CVE-2019-25634CWE-787

Base64 Decoder 1.1.2 Local Buffer Overflow SEH Egghunter

High · published March 24, 2026

CVSS v4.0
8.6
EPSS
0%
Percentile
17.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
8.6 · HIGH
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
EPSS
0.00266 · 17.8th percentile
Weakness
CWE-787 · Out-of-bounds Write
Published
2026-03-24T11:27Z
EPSS history
Timeline
  • 24 MAR 11:27Z
    Base64 Decoder 1.1.2 Local Buffer Overflow SEH Egghunter
    cvelistv5