PT-2026-27361 · Flexhex · Flexhex

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

Positive Technologies (AI Summary)

CVSS v3.1

8.4

High

Base vector

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

Name of the Vulnerable Software and Affected Versions FlexHEX version 2.71

Description A local buffer overflow exists in the Stream Name field. This allows local attackers to execute arbitrary code by triggering a structured exception handler (SEH) overflow—a condition where the program's error-handling mechanism is overwritten to redirect execution flow. An attacker can achieve this by creating a malicious text file containing shellcode and aligned SEH chain pointers and pasting the content into the Stream Name dialog.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

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