Vulnerability · Published Sep 28, 2026 · Assigned by VulDB

CVE-2026-101039FAST FAC1900R devdiscover Service copy_msg_element stack-based overflow

Critical 10.0

In plain English

A critical-severity stack buffer overflow in FAC1900R from FAST. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 55% of all known vulnerabilities).

Severity (CVSS 3.1)10.0Critical

Exploit odds (30 days)0.7%top 45.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A vulnerability was identified in FAST FAC1900R 20190827_2.0.2. Affected by this issue is the function copy_msg_element of the component devdiscover Service. Such manipulation leads to stack-based buffer overflow. The attack can be executed remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.

Affected products (as reported)

Vendor	Product	Versions
FAST	FAC1900R	20190827_2.0.2

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

References

VDB-410907 | FAST FAC1900R devdiscover Service copy_msg_element stack-based overflow vdb-entry, technical-description
VDB-410907 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
CVE-2026-101039 | CVE Analysis and Report third-party-advisory
Submit #927251 | FAST FAC1900R 20190827_2.0.2 Stack-based Buffer Overflow third-party-advisory
https://github.com/xiaobor123/vuls-find-VxWorks/tree/main/vul-find-FAST_FAC1900R-copy_msg_element(2) exploit