What’s Vulnerable › Vulnerabilities

CVE-2019-25627: FlexHEX 2.71 Local Buffer Overflow via SEH Unicode

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-24 · updated 2026-06-17
• Weakness: CWE-434

Description

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: 2.71

References

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

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