CVE-2017-20228

HIGH 8.4

Flat Assembler 1.71.21 Stack-Based Buffer Overflow ROP

CVSS Score

8.4

EPSS Score

0.0%

EPSS Percentile

2th

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 bytes to overwrite the instruction pointer and execute return-oriented programming chains for shell command execution.

CWE	CWE-787
Vendor	flatassembler
Product	flat assembler
Published	Mar 28, 2026
Last Updated	Mar 30, 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

Flatassembler / Flat Assembler

1.71.21

References

NVD ↗ CVE.org ↗ EPSS Data ↗

exploit-db.com: https://www.exploit-db.com/exploits/42265 flatassembler.net: http://www.flatassembler.net vulncheck.com: https://www.vulncheck.com/advisories/flat-assembler-stack-based-buffer-overflow-rop

Credits

Juan Sacco <[email protected]> at KPN Red Team - http://www.kpn.com