| Name | CVE-2013-4421 |
| Description | 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 726019 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| dropbear (PTS) | bullseye | 2020.81-3+deb11u2 | fixed |
| bullseye (security) | 2020.81-3+deb11u3 | fixed |
| bookworm | 2022.83-1+deb12u3 | fixed |
| forky, sid, trixie | 2025.88-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| dropbear | source | (unstable) | 2012.55-1.4 | low | | 726019 |
Notes
[squeeze] - dropbear <no-dsa> (Minor issue)
[wheezy] - dropbear <no-dsa> (Minor issue)
https://hg.ucc.asn.au/dropbear/rev/0bf76f54de6f