What is CVE-2016-6154?

CVE-2016-6154 is a medium-severity vulnerability in Microsoft Windows, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-08-23.

How severe is CVE-2016-6154?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Microsoft Windows

CVE-2016-6154

The authentication applet in Watchguard Fireware 11.11 Operating System has reflected XSS (this can also cause an open redirect).

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-08-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.009 (59.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Weakness classification (CWE)

References

www.sec-1.com/blog/2016/sec-1-advisory-reflected-cross-site-scripting-open-redi… (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2016-6154?: CVE-2016-6154 is a medium-severity vulnerability in Microsoft Windows, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-08-23.
How severe is CVE-2016-6154?: Medium severity. CVSS v3 base score is 6.1 out of 10.