The vulnerability CVE-2026-101038 affects FAST FAC1200R version 5.0_20201119_1.0.2. It is a stack-based buffer overflow in the MmtAtePrase function of the MmtAtePrase Parser component. This flaw can be remotely exploited without user interaction or elevated privileges, potentially leading to severe impact. The vulnerability has a CVSS 4.0 score of 9.4, indicating critical severity. The vendor was contacted but did not respond, and no patch or mitigation has been disclosed. Public exploit code is available.

Successful exploitation of this vulnerability can lead to remote code execution or denial of service due to the stack-based buffer overflow. The attack requires no user interaction and can be performed remotely with low attack complexity and privileges. The vulnerability impacts confidentiality, integrity, and availability with high severity.

No official fix or patch is currently available from the vendor. Since the vendor has not responded and no remediation guidance is provided, users should consider isolating affected devices, applying network-level protections such as firewall rules to restrict access to the vulnerable component, and monitoring for exploitation attempts. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.