Buffer overflow in Fast Fac1203r Gigabit Edition
CVE-2026-96257
A flaw has been found in Fast FAC1203R Gigabit Edition 2.0.4. Affected by this issue is the function copy_msg_element of the component Device Discovery Service. Executing a manipulation can lead to stack-based buffer overflow. The attack can be executed remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.010 (64.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.010 · change: +0.005
Affected products
- Fast Fac1203r Gigabit Edition — versions 2.0.4
Weakness classification (CWE)
References
- github.com/xiaobor123/vuls-find-VxWorks/tree/main/vul-find-FAST_FAC1203R-copy_m… (exploit)
- vuldb.com/cve/CVE-2026-96257 (third-party-advisory)
- vuldb.com/submit/901889 (third-party-advisory)
- vuldb.com/vuln/408707 (technical-description, vdb-entry)
- vuldb.com/vuln/408707/cti (signature, permissions-required)
Frequently asked questions
- What is CVE-2026-96257?
- CVE-2026-96257 is a critical-severity vulnerability in Fast Fac1203r Gigabit Edition, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 10.0/10. Published 2026-09-23.
- How severe is CVE-2026-96257?
- Critical severity. CVSS v3 base score is 10.0 out of 10.