CVE-2016-5271: Mozilla Firefox

Medium severity, CVSS 6.5. EPSS: 1.4% chance of exploitation in the next 30 days.

The PropertyProvider::GetSpacingInternal function in Mozilla Firefox before 49.0 allows remote attackers to cause a denial of service (out-of-bounds read and application crash) via text runs in conjunction with a "display: contents" Cascading Style Sheets (CSS) property.

Affected products

• Mozilla Firefox: up to and including 48.0.2

Published 2016-09-22. Last modified 2026-06-17.