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 bytes to overwrite the instruction pointer and execute return-oriented programming chains for shell command execution.
Vulnerability class: Buffer Overflow
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.002 (11.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 11.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Flatassembler Flat Assembler — versions 1.71.21
- Flatassembler Flat Assembler
Weakness classification (CWE)
References
- ExploitDB-42265 (Exploit, exploit, VDB Entry)
- Official Product Homepage (Product, product)
- VulnCheck Advisory: Flat Assembler 1.71.21 Stack-Based Buffer Overflow ROP (Third Party Advisory, 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.