---
id: CVE-2026-101038
title: FAST FAC1200R MmtAtePrase stack-based overflow
summary: >-
  A vulnerability was determined in FAST FAC1200R 5.0_20201119_1.0.2. Affected
  by this vulnerability is the function MmtAtePrase of the component MmtAtePrase
  Parser. This manipulation causes stack-based buffer overflow. Remote
  exploitation…
severity: critical
cvss: 9.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R'
cvssSource: cna
cwe:
  - CWE-121
  - CWE-119
vendor: FAST
product: FAC1200R
affected:
  - FAC1200R 5.0_20201119_1.0.2
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-28T10:53:19.744257Z'
exploitAvailable: true
published: '2026-09-28'
updated: '2026-09-28'
sourceUpdated: '2026-09-28T10:53:39.470Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-101038'
references:
  - url: 'https://vuldb.com/vuln/410906'
    label: VDB-410906 | FAST FAC1200R MmtAtePrase stack-based overflow
  - url: 'https://vuldb.com/vuln/410906/cti'
    label: 'VDB-410906 | CTI Indicators (IOB, IOC, IOA)'
  - url: 'https://vuldb.com/cve/CVE-2026-101038'
    label: CVE-2026-101038 | CVE Analysis and Report
  - url: 'https://vuldb.com/submit/927237'
    label: >-
      Submit #927237 | FAST FAC1200R V5.0_20201119_1.0.2 Stack-based Buffer
      Overflow
  - url: >-
      https://github.com/xiaobor123/vuls-find-VxWorks/tree/main/vul-find-FAST_FAC1200R-twlantask-MmtAtePrase-stack-overflow(1)/vul-find-FAST_FAC1200R-twlantask-MmtAtePrase-stack-overflow
tags:
  - cve.org
  - exploit-available
ingestedAt: '2026-09-28T11:08:06.671Z'
---

## Overview

A vulnerability was determined in FAST FAC1200R 5.0_20201119_1.0.2. Affected by this vulnerability is the function MmtAtePrase of the component MmtAtePrase Parser. This manipulation causes stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.

## Affected

- `FAC1200R 5.0_20201119_1.0.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.