A CWE-306: Missing Authentication for Critical Function vulnerability exists in C-Bus Toolkit v1.15.8 and prior that could allow an attacke…

published 2021-07-21 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-9919

cvss: 5.7; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 12.1%; EPSS 12.1% chance of exploitation in 30 days, percentile 96%
public exploits: 0; none known

A CWE-306: Missing Authentication for Critical Function vulnerability exists in C-Bus Toolkit v1.15.8 and prior that could allow an attacker to use a crafted webpage to obtain remote access to the system.

Patch / fix

fixed in 1

schneider-electric c-bus_toolkit 1.15.9

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-21-194-01 updated 2021-07-13 cvss 6.5

Schneider Electric C-Bus Toolkit

Schneider Electric Software, LLC C-Bus Toolkit <= 1.15.8
affected: mitigation “Schneider Electric recommends users to update to Version 1.15.9 or later. Note: A reboot will be needed after the update.” se.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

12.08% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

tenable.com https://www.tenable.com/security/research/tra-2021-50 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.7	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N
NVD	2.0	3.5	AV:N/AC:M/Au:S/C:N/I:P/A:N

Affected products

n/a C-Bus Toolkit v1.15.8 and prior

Classification

Weakness

CWE-306 Missing Authentication for Critical Functionality

References

tenable.com /security/research/tra-2021-50
exploit, third-party-advisory
download.schneider-electric.com /files?p_Doc_Ref=SEVD-2021-194-04
product, vendor-advisory

Sources

CVE List CVE-2021-22784
NVD CVE-2021-22784

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary