FlexHEX 2.71 Local Buffer Overflow via SEH Unicode (CVE-2019-25627) | HOL Guard CVE

High · CVSS 8.6CVE-2019-25627

FlexHEX 2.71 Local Buffer Overflow via SEH Unicode

Answer in brief

CVE-2019-25627 records a High severity (CVSS 8.6) vulnerability in FlexHEX 2.71 Local Buffer Overflow via SEH Unicode. The current sources do not mark it as known exploited. The current feed maps Flexhex/FlexHEX (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Mar 24, 2026Updated Oct 1, 2026Source checked Oct 1, 2026First seen by HOL Oct 1, 2026Material review Oct 1, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.6
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 8.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Flexhex/FlexHEX (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Flexhex/FlexHEXgeneric	2.71	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Flexhex/FlexHEX.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Mar 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 1, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.