What is CVE-2023-6545?

CVE-2023-6545 is a medium-severity vulnerability in Beckhoff Authelia-Bhf, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 4.7/10. Published 2023-12-14.

How severe is CVE-2023-6545?

Medium severity. CVSS v3 base score is 4.7 out of 10.

Open Redirect in Beckhoff Authelia-Bhf

CVE-2023-6545

The package authelia-bhf included in Beckhoffs TwinCAT/BSD is prone to an open redirect that allows a remote unprivileged attacker to redirect a user to another site. This may have limited impact to integrity and does solely affect anthelia-bhf the Beckhoff fork of authelia.

Vulnerability class: Open Redirect

Published 2023-12-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (35.3th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Beckhoff Authelia-Bhf
Beckhoff Authelia-Bhf Of Twincat/bsd — versions 0
Beckhoff Twincat\/bsd

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

cert.vde.com/en/advisories/VDE-2023-067/ (Third Party Advisory)
download.beckhoff.com/download/Document/product-security/Advisories/advisory-20… (Vendor Advisory)

Frequently asked questions

What is CVE-2023-6545?: CVE-2023-6545 is a medium-severity vulnerability in Beckhoff Authelia-Bhf, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 4.7/10. Published 2023-12-14.
How severe is CVE-2023-6545?: Medium severity. CVSS v3 base score is 4.7 out of 10.