What is CVE-2019-11737?

CVE-2019-11737 is a medium-severity vulnerability in Mozilla Firefox, classified under Insufficient Verification of Data Authenticity. CVSS score: 5.3/10. Published 2019-09-27.

How severe is CVE-2019-11737?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Mozilla Firefox

CVE-2019-11737

If a wildcard ('*') is specified for the host in Content Security Policy (CSP) directives, any port or path restriction of the directive will be ignored, leading to CSP directives not being properly applied to content. This vulnerability affects Firefox < 69.

Published 2019-09-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (43.6th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 43.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Mozilla Firefox — versions unspecified

Weakness classification (CWE)

CWE-345 — Insufficient Verification of Data Authenticity

References

bugzilla.mozilla.org/show_bug.cgi (Permissions Required, Issue Tracking, Vendor Advisory)
www.mozilla.org/security/advisories/mfsa2019-25/ (Vendor Advisory)

Frequently asked questions

What is CVE-2019-11737?: CVE-2019-11737 is a medium-severity vulnerability in Mozilla Firefox, classified under Insufficient Verification of Data Authenticity. CVSS score: 5.3/10. Published 2019-09-27.
How severe is CVE-2019-11737?: Medium severity. CVSS v3 base score is 5.3 out of 10.