CVE-2026-101037
Received Received - Intake

Stack-Based Buffer Overflow in FAST FAC1200R Device

Vulnerability report for CVE-2026-101037, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-09-28

Last updated on: 2026-09-28

Assigner: VulDB

Description

A vulnerability was found in FAST FAC1200R 5.0_20201119_1.0.2. Affected is the function parse_advertisement_frame of the component devdiscover Service. The manipulation results in stack-based buffer overflow. The attack may be launched remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS Scores

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Meta Information

Published
2026-09-28
Last Modified
2026-09-28
Generated
2026-09-28
AI Q&A
2026-09-28
EPSS Evaluated
N/A
NVD
EUVD

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
fast fac1200r 5.0_20201119_1.0.2

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-121 A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
CWE-119 The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Attack-Flow Graph

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Executive Summary

This is a stack-based buffer overflow in the FAST FAC1200R router firmware version 5.0_20201119_1.0.2. The vulnerability exists in the devdiscover service which processes UDP packets on port 5001. When handling type-1 advertisement packets, the service fails to validate message element length fields properly, leading to an out-of-bounds stack copy. Attackers can exploit this by sending specially crafted UDP packets with large length values to crash the service or potentially execute arbitrary code.

Detection Guidance

To detect this vulnerability, scan for open UDP port 5001 on your network using tools like nmap. Check if the devdiscover service is running on FAST FAC1200R devices. Monitor for crashes or unusual behavior in the service. Use packet capture tools like tcpdump to analyze traffic on port 5001 for malformed advertisement packets.

Impact Analysis

This vulnerability allows remote attackers to crash the devdiscover service on affected routers by sending malicious UDP packets. In severe cases, it could enable control-flow hijacking, potentially leading to unauthorized access or code execution on the device. Since the service runs on UDP port 5001, systems exposed to untrusted networks are at higher risk.

Compliance Impact

This vulnerability, a stack-based buffer overflow in the FAST FAC1200R router, could lead to unauthorized access or control of the device. For GDPR, it may compromise data integrity and confidentiality if exploited. For HIPAA, it could expose protected health information if the device processes such data. Both standards require safeguarding against unauthorized access and ensuring data protection.

Mitigation Strategies

Immediately restrict access to UDP port 5001 using firewall rules to limit exposure. Block external traffic to this port while allowing only trusted internal sources. Monitor the devdiscover service for crashes or anomalies. Contact the vendor for firmware updates or patches. If no patch is available, consider isolating affected devices from critical network segments.

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