PT-2026-27361 · Flexhex · Flexhex

Chris Au · Published 2026-03-24 · Updated 2026-03-24 · CVE-2019-25627

NVD

CVSS v3.1

8.4

High

AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Exploit

Fix

Unrestricted File Upload

Weakness Enumeration

CWE-434

Related Identifiers

CVE-2019-25627

Affected Products

Flexhex

References · 5

• 🔥 https://exploit-db.com/exploits/46665 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2019-25627 · Security Note
• http://flexhex.com · Note
• http://flexhex.com/download/flexhex_setup.exe · Note
• https://vulncheck.com/advisories/flexhex-local-buffer-overflow-via-seh-unicode · Note