Stack-Based Buffer Overflow in FAST FAC1203R by FAST
CVE-2026-101354

9.4CRITICAL

Key Information:

Vendor

Fast

Status
Fac1203r
Vendor
CVE Published:
29 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-101354?

A security flaw has been identified in the FAST FAC1203R product, specifically within the _tWlanTask function of the MmtAtePrase Parser. This vulnerability allows for a stack-based buffer overflow, which could potentially be exploited by attackers with access to the local network. The exploit code has been made public, raising heightened concerns for affected users. The vendor has been notified about this vulnerability but has not yet issued a response, leaving systems potentially open to exploitation.

Affected Version(s)

FAC1203R 20200116_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-2026-101354 - Proof of Concept

References

https://vuldb.com/vuln/411088
vdb-entrytechnical-description
https://vuldb.com/vuln/411088/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-101354
third-party-advisory

CVSS V4

Score:
9.4
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Adjacent 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
.