CVE-2013-4421: Dropbear SSH Project Dropbear SSH

Medium severity, CVSS 5.0. EPSS: 6.4% chance of exploitation in the next 30 days.

The buf_decompress function in packet.c in Dropbear SSH Server before 2013.59 allows remote attackers to cause a denial of service (memory consumption) via a compressed packet that has a large size when it is decompressed.

Affected products

• Dropbear SSH Project Dropbear SSH: before 2013.59 (fixed in 2013.59)

Published 2013-10-25. Last modified 2026-06-16.