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Back to active CVEs
High · CVSS 8.6CVE-2017-20228

Flat Assembler 1.71.21 Stack-Based Buffer Overflow ROP

Answer in brief

CVE-2017-20228 records a High severity (CVSS 8.6) vulnerability in Flat Assembler 1.71.21 Stack-Based Buffer Overflow ROP. The current sources do not mark it as known exploited. The current feed maps Flatassembler/Flat Assembler (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Mar 28, 2026Updated Oct 1, 2026Source checked Oct 2, 2026First seen by HOL Oct 1, 2026Material review Oct 1, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.6
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 8.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Flatassembler/Flat Assembler (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Flatassembler/Flat Assemblergeneric1.71.21Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Flatassembler/Flat Assembler.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Mar 28, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 1, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 1, 2026

Sources and claim methodology

  • Source referenceexploit-db.com
  • Source referencevulncheck.com
  • Source referenceflatassembler.net
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

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Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-787
Source
CVE List V5
Source checked
Oct 2, 2026
References
3 linked sources
Open source record