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CVE-2021-47881

MediumPublished

dataSIMS Avionics ARINC 664-1 - Local Buffer Overflow

Published: Jan 23, 2026
Updated: Jan 23, 2026
Assigning CNA: VulnCheck
Evidence observed: Aug 11, 2026

Primary CVSS

6.7/ 10Medium

nvd · CVSS 4.0

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/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

EPSS probability estimate

0.2%

Low · next 30 days

Percentile: 10.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

dataSIMS Avionics ARINC 664-1 version 4.5.3 contains a local buffer overflow vulnerability that allows attackers to overwrite memory by manipulating the milstd1553result.txt file. Attackers can craft a malicious file with carefully constructed payload and alignment sections to potentially execute arbitrary code on the Windows system.

Sources

CVE-2021-47881PoC
PoC and analysis of a local stack-buffer-overflow in dataSIMS Avionics ARINC 664-1 v4.5.3, with payload breakdown, reproduction script, and CVE record corrections.

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