Stack-based Buffer Overflow in FAST FAC1200R by FAST
CVE-2026-101038

9.4CRITICAL

Key Information:

Vendor

Fast

Status
Fac1200r
Vendor
CVE Published:
28 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-101038?

A vulnerability exists in the FAST FAC1200R version 5.0_20201119_1.0.2, specifically within the MmtAtePrase function of the MmtAtePrase Parser. This issue involves a stack-based buffer overflow that may be remotely exploited, potentially leading to unauthorized access and system compromise. The exploit details have been made public, increasing the urgency for users to secure their systems. Efforts to notify the vendor prior to disclosure were met with no response.

Affected Version(s)

FAC1200R 5.0_20201119_1.0.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-101038 - Proof of Concept

References

https://vuldb.com/vuln/410906
vdb-entrytechnical-description
https://vuldb.com/vuln/410906/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-101038
third-party-advisory

CVSS V4

Score:
9.4
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

xiaobor123 (VulDB User)
VulDB CNA Team
.