CVE-2017-5400: Debian Linux

Critical severity, CVSS 9.8. EPSS: 3.6% chance of exploitation in the next 30 days.

JIT-spray targeting asm.js combined with a heap spray allows for a bypass of ASLR and DEP protections leading to potential memory corruption attacks. This vulnerability affects Firefox < 52, Firefox ESR < 45.8, Thunderbird < 52, and Thunderbird < 45.8.

Affected products

• Debian Debian Linux: version 8.0 only
• Mozilla Firefox: before 45.8.0 (fixed in 45.8.0); before 52.0 (fixed in 52.0)
• Mozilla Thunderbird: before 45.8.0 (fixed in 45.8.0)
• Red Hat Enterprise Linux Desktop: version 5.0 only; version 6.0 only; version 7.0 only
• Red Hat Enterprise Linux Server: version 5.0 only; version 6.0 only; version 7.0 only
• Red Hat Enterprise Linux Server Aus: version 7.3 only; version 7.4 only
• Red Hat Enterprise Linux Server Eus: version 7.3 only; version 7.4 only; version 7.5 only
• Red Hat Enterprise Linux Workstation: version 5.0 only; version 6.0 only; version 7.0 only

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