No exploitation reportedFix available

CVE-2023-5399

Q: Is CVE-2023-5399 actively exploited?

Active exploitation of CVE-2023-5399 has not been confirmed. Its EPSS score was 35.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2023-5399?

CVE-2023-5399 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2023-10-04
Fixed in1.16.4
WeaknessCWE-22

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability exists that could cause tampering of files on the personal computer running C-Bus when using the File Command.

Timeline

dates in UTC

2023-10-0419:15CVE publishedNVD
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-5399?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-5399?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Schneider-electric spacelogic c-bus toolkit

Branch	Affected	Fixed in	Source
1.16	< 1.16.4	1.16.4	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-23-306-06 CISA1 known affected
Schneider Electric SpaceLogic C-Bus Toolkit
SpaceLogic C-Bus Toolkit: <=1.16.3

Full record on NVD

Fix

Update Schneider-electric spacelogic c-bus toolkit to 1.16.4
Vendor fix CISA ICSA-23-306-06 · 1 productSchneider Electric has provided a fix to these vulnerabilities and recommends updating the software to v1.16.4. After installation, it is recommended to reboot the system and verify the version number reflects the new version.
Mitigation from the vendor CISA ICSA-23-306-06 · 1 productIf users choose not to apply the remediation provided , they should immediately apply the following mitigation to reduce the risk of exploit: Block TCP Port 20023 to SpaceLogic C-Bus Toolkit by using the rules in the PC firewall.
Mitigation from the vendor CISA ICSA-23-306-06 · 1 productBy doing this, the vulnerable commands could not then be used to compromise the PC by an external entity as the connection and ultimately the command will not be accepted by SpaceLogic C-Bus Toolkit.
Mitigation from the vendor CISA ICSA-23-306-06 · 1 productFor more information, refer to Schneider Electric's Security Bulletin SEVD-2023-283-1
Mitigation from the vendor CISA ICSA-23-306-06 · 1 productSchneider Electric strongly recommends the following industry cybersecurity best practices.
Mitigation from the vendor CISA ICSA-23-306-06 · 1 productLocate control and safety system networks and remote devices behind firewalls andisolate them from the business network.

Advisories and patches

download.schneider-electric.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2025-02-26
OpenCVESSVC decisionnone—
CNACVSS 3.19.8read 2026-10-23
NVDCVSS 3.19.8read 2026-10-23
CNAweakness (CWE)CWE-22read 2026-10-23
FIRST EPSSEPSS score35.5 %read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2023-10-04
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2023-5399?

Is CVE-2023-5399 actively exploited?

Active exploitation of CVE-2023-5399 has not been confirmed. Its EPSS score was 35.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-5399?

CVE-2023-5399 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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