Vulnerability · Published Sep 28, 2026 · Assigned by VulDB

CVE-2026-101038FAST FAC1200R MmtAtePrase stack-based overflow

Critical 9.9

In plain English

A critical-severity stack buffer overflow in FAC1200R from FAST. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities).

Severity (CVSS 3.1)9.9Critical

Exploit odds (30 days)0.4%top 61.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A vulnerability was determined in FAST FAC1200R 5.0_20201119_1.0.2. Affected by this vulnerability is the function MmtAtePrase of the component MmtAtePrase Parser. This manipulation causes stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.

Affected products (as reported)

Vendor	Product	Versions
FAST	FAC1200R	5.0_20201119_1.0.2

Weakness: CWE-121, CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R

References

VDB-410906 | FAST FAC1200R MmtAtePrase stack-based overflow vdb-entry, technical-description
VDB-410906 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
CVE-2026-101038 | CVE Analysis and Report third-party-advisory
Submit #927237 | FAST FAC1200R V5.0_20201119_1.0.2 Stack-based Buffer Overflow third-party-advisory
https://github.com/xiaobor123/vuls-find-VxWorks/tree/main/vul-find-FAST_FAC1200R-twlantask-MmtAtePrase-stack-overflow(1)/vul-find-FAST_FAC1200R-twlantask-MmtAtePrase-stack-overflow exploit