CVE-2019-13115: Debian Linux

High severity, CVSS 8.1. EPSS: 11.7% chance of exploitation in the next 30 days.

In libssh2 before 1.9.0, kex_method_diffie_hellman_group_exchange_sha256_key_exchange in kex.c has an integer overflow that could lead to an out-of-bounds read in the way packets are read from the server. A remote attacker who compromises a SSH server may be able to disclose sensitive information or cause a denial of service condition on the client system when a user connects to the server. This is related to an _libssh2_check_length mistake, and is different from the various issues fixed in 1.8.1, such as CVE-2019-3855.

Affected products

• Debian Debian Linux: version 8.0 only; version 9.0 only
• F5 Traffix Systems Signaling Delivery Controller: from 5.0.0, up to and including 5.1.0
• Fedoraproject Fedora: version 29 only; version 30 only
• LIBSSH2 LIBSSH2: before 1.9.0 (fixed in 1.9.0)
• Netapp Cloud Backup: affected versions not specified
• Netapp E-Series Santricity OS Controller: from 11.0.0, up to and including 11.70.1
• Netapp Ontap Select Deploy Administration Utility: affected versions not specified

Published 2019-07-16. Last modified 2026-06-17.