How severe is CVE-2017-11401?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2017-11401 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Belden Tofino Xenon Security Appliance

CVE-2017-11401

An issue has been discovered on the Belden Hirschmann Tofino Xenon Security Appliance before 03.2.00. Improper handling of the mbap.length field of ModBus packets in the ModBus DPI filter allows an attacker to send malformed/crafted packets to a protected asset, bypassing function code filtering.

Published 2017-11-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.014 (71.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 71.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

www.belden.com/hubfs/support/security/bulletins/Belden-Security-Bulletin-BSECV-… (Vendor Advisory)
github.com/airbus-seclab/security-advisories/blob/master/belden/tofino.txt (Third Party Advisory)

Frequently asked questions

What is CVE-2017-11401?: CVE-2017-11401 is a critical-severity vulnerability in Belden Tofino Xenon Security Appliance. CVSS score: 9.8/10. Published 2017-11-20.
How severe is CVE-2017-11401?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2017-11401 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.