What is CVE-2017-20228?

CVE-2017-20228 is a high-severity vulnerability in Flatassembler Flat Assembler, classified under Out-of-bounds Write. CVSS score: 8.4/10. Published 2026-03-28.

How severe is CVE-2017-20228?

High severity. CVSS v3 base score is 8.4 out of 10.

Buffer overflow in Flatassembler Flat Assembler

CVE-2017-20228

Flat Assembler 1.71.21 contains a stack-based buffer overflow vulnerability that allows local attackers to execute arbitrary code by supplying oversized input to the application. Attackers can craft malicious assembly input exceeding 5895…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (7.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Flatassembler Flat Assembler — versions 1.71.21

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

ExploitDB-42265 (exploit)
Official Product Homepage (product)
VulnCheck Advisory: Flat Assembler 1.71.21 Stack-Based Buffer Overflow ROP (third-party-advisory)

Frequently asked questions

What is CVE-2017-20228?: CVE-2017-20228 is a high-severity vulnerability in Flatassembler Flat Assembler, classified under Out-of-bounds Write. CVSS score: 8.4/10. Published 2026-03-28.
How severe is CVE-2017-20228?: High severity. CVSS v3 base score is 8.4 out of 10.