CVE-2019-25627 FlexHEX 2.71 Local Buffer Overflow via SEH Unicode
Local attackers can execute arbitrary code by triggering a buffer overflow in the Stream Name field of FlexHEX via a crafted file.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-25627?
CVE-2019-25627 is a high-severity memory corruption vulnerability in FlexHEX, published on 24 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-434
Which versions are affected by CVE-2019-25627?
It affects 1 product.
Products include Flexhex Flexhex.
How do I fix CVE-2019-25627?
No fix has been published for CVE-2019-25627 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2019-25627 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-25627 exists.
Sources
Also known as GHSA-4g2g-3x54-996g.