Stack-Based Buffer Overflow in Fast FAC1203R Gigabit Edition Device Discovery Service
CVE-2026-96257

10CRITICAL

Key Information:

Vendor

Fast

Status
Fac1203r Gigabit Edition
Vendor
CVE Published:
23 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-96257?

A vulnerability exists in the Fast FAC1203R Gigabit Edition 2.0.4, specifically within the 'copy_msg_element' function of the Device Discovery Service. This flaw allows attackers to manipulate the functionality, potentially leading to a stack-based buffer overflow. The vulnerability can be exploited remotely, posing significant risks to users and their systems. The vendor was notified of this issue; however, they have not responded to the disclosure.

Affected Version(s)

FAC1203R Gigabit Edition 2.0.4

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-2026-96257 - Proof of Concept

References

https://vuldb.com/vuln/408707
vdb-entrytechnical-description
https://vuldb.com/vuln/408707/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-96257
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
.