Security readout for executives and security teams
Flat Assembler 1.71.21 is reported vulnerable to a stack-based buffer overflow. A local attacker who can supply oversized assembly input to the application may be able to take control of execution and run code with the privileges of the Flat Assembler process. Exposure is most relevant on systems that have Flat Assembler 1.71.21 installed and process assembly files from untrusted users, repositories, uploads, build jobs, or automation. Internet-facing exposure is not indicated by the bundle because the vulnerability is local, but CI/build environments and developer workstations may still be at risk if they compile attacker-controlled input. Treat as high priority for environments that compile untrusted or externally supplied assembly input. Prioritize build infrastructure, shared developer systems, and automation first; systems without Flat Assembler 1.71.21 or without untrusted input paths are lower immediate priority. Mitigation focus: Identify and remove or isolate Flat Assembler 1.71.21 where it is not required.; Check official Flat Assembler guidance and trusted distribution channels for an updated or fixed release before upgrading, because the bundle does not provide patch evidence.; Do not process untrusted assembly input with the affected version..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-787: Exact CWE lookup
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Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2017-20228 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.6 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
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CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
8.6HighVector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-42265CVE reference · exploit
- VulnCheck Advisory: Flat Assembler 1.71.21 Stack-Based Buffer Overflow ROPCVE reference · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.