What is the CVSS score of CVE-2021-47881?

CVE-2021-47881 has a CVSS 3.1 base score of 8.4 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Is there a public PoC exploit available for CVE-2021-47881?

Yes, a public proof-of-concept exploit is available for CVE-2021-47881. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2021-47881?

Within 24 hours: Identify all systems running dataSIMS Avionics version 4.5.3 and assess which are directly exposed to untrusted users; implement strict file access controls on milstd1553result.txt (read-only permissions, restricted ownership). Within 7 days: Isolate affected avionics systems to network segments with minimal lateral movement capability; enable file integrity monitoring and access logging on milstd1553result.txt; contact dataSIMS for patch timeline and interim guidance. Within 30 days: Deploy compensating controls including application sandboxing or containerization; evaluate upgrade feasibility to patched version when released; conduct vulnerability scan of dependent systems.

Windows CVE-2021-47881

HIGH

Stack-based Buffer Overflow (CWE-121)

2026-01-23 disclosure@vulncheck.com

Windows Buffer Overflow Industrial

8.4

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-121 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Stack buffer bounds checking MITRE ATT&CK 1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS 8.4 (HIGH). Attack vector: Local. Complexity: Low. Privileges required: None. User interaction: None. Exploitable via local access. Public exploit/POC available.
Exploit ScenarioDerived	An attacker could exploit this vulnerability to overwrite memory by manipulating the milstd1553result.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

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. [CVSS 8.4 HIGH]

RemediationAI

Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible.

Affected ProductsAI

dataSIMS Avionics ARINC 664-1 version 4.5.3 contains a local buffer overflow vulnerability that allows attackers to overwrite memory by manipulating t

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Classified as CWE-121 (Stack-based Buffer Overflow). 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.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 8.4 HIGH

AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

PoC Detected

Jan 26, 2026 - 15:03 vuln.today

Public exploit code

CVE Published

Jan 23, 2026 - 17:15 nvd

HIGH 8.4

DescriptionCVE.org

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.

Executive ViewAI

Why It Matters

dataSIMS Avionics ARINC 664-1 version 4.5.3 contains a high-severity local buffer overflow vulnerability that could allow authenticated users or threat actors with local system access to execute arbitrary code and compromise avionics systems. Organizations operating this software require immediate action to assess exposure and implement protective measures, as no vendor patch is currently available.

Business Impact: High

Compensating Controls

Restrict file system permissions on milstd1553result.txt to read-only access by the application service account only; disable local user write access; implement host-based intrusion detection (HIDS) monitoring for buffer overflow attack patterns targeting this process; network segmentation to limit local access vectors; enable Security Enhanced Linux (SELinux) or AppArmor mandatory access controls; monitor application logs for unexpected file modifications; apply principle of least privilege to user accounts with system access; use file integrity monitoring (AIDE, Tripwire) on the vulnerable file path.

Threat Intelligence Overview

EPSS Score

0.0%

Top 95% exploitable

Exploit

POC

Public exploit code exists

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS

Exploit-DB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC Yes

EPSS 0.0%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

Poc

System Exposure· derived

Small

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +42

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.