CVE-2019-25627

HIGH 8.4

FlexHEX 2.71 Local Buffer Overflow via SEH Unicode

CVSS Score

8.4

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-434
Vendor	flexhex
Product	flexhex
Published	Mar 24, 2026
Last Updated	Mar 24, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

Flexhex / FlexHEX

2.71

References

NVD ↗ CVE.org ↗ EPSS Data ↗

exploit-db.com: https://www.exploit-db.com/exploits/46665 flexhex.com: http://www.flexhex.com flexhex.com: http://www.flexhex.com/download/flexhex_setup.exe vulncheck.com: https://www.vulncheck.com/advisories/flexhex-local-buffer-overflow-via-seh-unicode

Credits

Chris Au