What is CVE-2026-8673?

CVE-2026-8673 is a medium-severity vulnerability in Avantra, classified under Unprotected Transport of Credentials. CVSS score: 5.9/10. Published 2026-05-22.

How severe is CVE-2026-8673?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Avantra

CVE-2026-8673

Unprotected transport of credentials vulnerability in syslink software AG Avantra on Linux, Windows allows Sniffing Attacks. This issue affects Avantra: before 25.3.0.

EPSS: 0.000 (12.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N.

Affected products

Avantra
Linux Linux_kernel
Microsoft Windows
Syslink Software Ag Avantra — versions 0

Weakness classification (CWE)

CWE-523 — Unprotected Transport of Credentials

References

vulnerability@ncsc.ch (vendor-advisory, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-8673?: CVE-2026-8673 is a medium-severity vulnerability in Avantra, classified under Unprotected Transport of Credentials. CVSS score: 5.9/10. Published 2026-05-22.
How severe is CVE-2026-8673?: Medium severity. CVSS v3 base score is 5.9 out of 10.