CVE-2015-5291: Debian Linux

Medium severity, CVSS 6.8. EPSS: 3.7% chance of exploitation in the next 30 days.

Heap-based buffer overflow in PolarSSL 1.x before 1.2.17 and ARM mbed TLS (formerly PolarSSL) 1.3.x before 1.3.14 and 2.x before 2.1.2 allows remote SSL servers to cause a denial of service (client crash) and possibly execute arbitrary code via a long hostname to the server name indication (SNI) extension, which is not properly handled when creating a ClientHello message. NOTE: this identifier has been SPLIT per ADT3 due to different affected version ranges. See CVE-2015-8036 for the session ticket issue that was introduced in 1.3.0.

Affected products

• Debian Debian Linux: version 7.0 only; version 8.0 only
• Fedoraproject Fedora: version 21 only; version 22 only; version 23 only
• Opensuse Leap: version 42.1 only
• Opensuse Opensuse: version 13.2 only
• Polarssl Polarssl: from 1.0.0, before 1.2.17 (fixed in 1.2.17)
• Trustedfirmware Mbed TLS: from 1.3.0, before 1.3.14 (fixed in 1.3.14); from 2.0.0, before 2.1.2 (fixed in 2.1.2)

Published 2015-11-02. Last modified 2026-06-17.