CVE-2017-5413: Mozilla Firefox

Critical severity, CVSS 9.8. EPSS: 1.9% chance of exploitation in the next 30 days.

A segmentation fault can occur during some bidirectional layout operations. This vulnerability affects Firefox < 52 and Thunderbird < 52.

Affected products

• Mozilla Firefox: before 52.0 (fixed in 52.0)
• Mozilla Thunderbird: before 52.0 (fixed in 52.0)

Published 2018-06-11. Last modified 2026-06-17.