Stack-Based Buffer Overflow in Flat Assembler by Flat Assembler
CVE-2017-20228

8.6HIGH

Key Information:

Vendor

Flatassembler

Status
Flat Assembler
Vendor
CVE Published:
28 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2017-20228?

Flat Assembler 1.71.21 is susceptible to a stack-based buffer overflow that can be exploited by local attackers. By providing oversized input, exceeding 5895 bytes, attackers can overwrite the instruction pointer, leading to unauthorized code execution via return-oriented programming (ROP) chains. This vulnerability facilitates the execution of shell commands, highlighting the importance of secure coding practices to mitigate such risks.

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Affected Version(s)

Flat Assembler 1.71.21

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2017-20228 - Proof of Concept

References

https://www.exploit-db.com/exploits/42265
exploit
http://www.flatassembler.net
product
https://www.vulncheck.com/advisories/flat-assembler-stack...
third-party-advisory

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Juan Sacco <juan.sacco@kpn.com> at KPN Red Team - http://www.kpn.com
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