Is CVE-2026-96257 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-96257 being exploited in the wild.

How severe is CVE-2026-96257?

Critical severity, with a CVSS score of 10, published 23 September 2026.

Which products and versions are affected?

Fast FAC1203R Gigabit Edition 2.0.4.

Is there a fix for CVE-2026-96257?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-96257 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-96257?

Check whether you run Fast FAC1203R Gigabit Edition at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-96257: Fast FAC1203R stack buffer overflow in Device Discovery Service

CVE-2026-96257 · Severity: critical · CVSS 10 · Published 2026-09-23

Fast FAC1203R is a Gigabit router used in network infrastructure. A stack-based buffer overflow in the Device Discovery Service component allows remote attackers to execute arbitrary code without authentication. An attacker can exploit this remotely to compromise the router and potentially pivot to other network devices.

Vendors: Fast.

Quick answers

Is CVE-2026-96257 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-96257 being exploited in the wild.
How severe is CVE-2026-96257?: Critical severity, with a CVSS score of 10, published 23 September 2026.
Which products and versions are affected?: Fast FAC1203R Gigabit Edition 2.0.4.
Is there a fix for CVE-2026-96257?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-96257 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-96257?: Check whether you run Fast FAC1203R Gigabit Edition at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A stack-based buffer overflow vulnerability exists in the copy_msg_element function of the Device Discovery Service component in FAC1203R Gigabit Edition. The vulnerability is remotely exploitable without requiring authentication, and public exploit code has been published. A successful exploit results in arbitrary code execution with the privileges of the affected service.

Affected products

Fast FAC1203R Gigabit Edition 2.0.4

Timeline

2026-09-23: disclosed
other: Exploit published; vendor unresponsive

References

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