What’s Vulnerable › Vulnerabilities

CVE-2017-20228: Flat Assembler 1.71.21 Stack-Based Buffer Overflow ROP

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-28 · updated 2026-06-17
• Weakness: CWE-787

Description

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.

Affected products

• Flatassembler Flat Assembler: through 1.71.21

References

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

Get alerted when CVE-2017-20228 or the next vulnerability affects your stack