Stack-Based Buffer Overflow in FAST FAC1900R by FAST
CVE-2026-101039

10CRITICAL

Key Information:

Vendor

Fast

Status
Fac1900r
Vendor
CVE Published:
28 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-101039?

A security flaw has been discovered in the FAST FAC1900R 20190827_2.0.2, specifically in the copy_msg_element function of the devdiscover Service. This issue allows for a stack-based buffer overflow, which could be exploited remotely by attackers. Given that the exploit code is publicly accessible, there is a heightened risk of this vulnerability being leveraged in cyber attacks. The vendor has been notified of this critical issue but did not respond to requests for further information or remediation.

Affected Version(s)

FAC1900R 20190827_2.0.2

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-2026-101039 - Proof of Concept

References

https://vuldb.com/vuln/410907
vdb-entrytechnical-description
https://vuldb.com/vuln/410907/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-101039
third-party-advisory

CVSS V4

Score:
10
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
.