CVE-2019-25627: Flexhex

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

FlexHEX 2.71 contains a local buffer overflow vulnerability in the Stream Name field that allows local attackers to execute arbitrary code by triggering a structured exception handler (SEH) overflow. Attackers can craft a malicious text file with carefully aligned shellcode and SEH chain pointers, paste the contents into the Stream Name dialog, and execute arbitrary commands like calc.exe when the exception handler is triggered.

Affected products

• Flexhex Flexhex: version 2.71 only

Published 2026-03-24. Last modified 2026-06-17.