Flat Assembler 1.71.21 Stack-Based Buffer Overflow ROP
Priority HIGH 72CWE-787Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00223 13th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA and NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Flatassembler | Flat Assembler | 1.71.21 | — | No fix listed | CNA |
- Flat Assembler VendorFlatassembler Affected 1.71.21 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:flatassembler:flat_assembler:*:*:*:*:*:*:*:* | up to 1.71.21 | Vulnerable | Flatassembler |
- cpe:2.3:a:flatassembler:flat_assembler:*:*:*:*:*:*:*:* Versions up to 1.71.21 Vulnerable ·Flatassembler
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2017-20228
- 2026-10-03 Alias added: GHSA-g23f-7c8h-6698
References
Exploit 1
Other 1
Sources
- CVE-2017-20228 · CVE Program
- CVE-2017-20228 · NVD
- FIRST EPSS
- GHSA-g23f-7c8h-6698 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences