Flat Assembler 1.71.21 Stack-Based Buffer Overflow ROP
Published Mar 28, 2026
8.6
HIGHCVSS 4.0
EPSS 0.22%
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
-
- Version 1.71.21StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Flatassembler | Flat Assembler | n/a |
|
- ≤ 1.71.21
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
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
1 other source (NVD) ▾
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
1 other source (CVE.org) ▾
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
PoCAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Mar 30, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
Mar–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.22% (0.00219) | 11.18th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.22% (0.00219) | 12.26th | v5 (v2026.06.15) |
| Mar 28, 2026 | 0.02% (0.00016) | 3.83th | v4 (v2025.03.14) |
References (3)
- http://www.flatassembler.net product
- https://www.exploit-db.com/exploits/42265 exploitVDB Entry
- https://www.vulncheck.com/advisories/flat-assembler-stack-based-buffer-overflow-rop third-party-advisoryThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.flatassembler.net | product | |
| https://www.exploit-db.com/exploits/42265 | exploitVDB Entry | |
| https://www.vulncheck.com/advisories/flat-assembler-stack-based-buffer-overflow-rop | third-party-advisoryThird Party Advisory |
Change history (0)
No recorded changes yet.