Critical severity · published Sep 23, 2026
CVE-2026-96257
Fast FAC1203R Gigabit Edition Device Discovery Service copy_msg_element stack-based overflow
10.0
CVSS
1%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 64% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FG
FAC1203R Gigabit Edition · Fast
2.0.4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-96257
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-96257
github.com
https://github.com/xiaobor123/vuls-find-VxWorks/tree/main/vul-find-FAST_FAC1203R-copy_msg_element
vuldb.com
https://vuldb.com/cve/CVE-2026-96257
vuldb.com
https://vuldb.com/submit/901889
vuldb.com
https://vuldb.com/vuln/408707
vuldb.com
https://vuldb.com/vuln/408707/cti