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    CVE-2013-4421

    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.

    Published:Oct 25, 2013
    Last Modified:Apr 11, 2025
    EPS:Oct 25, 2013
    EPSS Score:0.25913
    CVSS Score:5

    Affected Products

    Vendor
    Dropbear Ssh Project
    Product
    Dropbear Ssh

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2025-47203 (CVSS 4.5) — dbclient in Dropbear SSH before 2025.88 allows command injection via an untrusted hostname argument, because a…
    CVE-2023-48795 (CVSS 5.9) — The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, al…
    CVE-2021-36369 (CVSS 7.5) — An issue was discovered in Dropbear through 2020.81. Due to a non-RFC-compliant check of the available authent…
    CVE-2020-36254 (CVSS 8.1) — scp.c in Dropbear before 2020.79 mishandles the filename of . or an empty filename, a related issue to CVE-201…
    CVE-2019-12953 (CVSS 5.3) — Dropbear 2011.54 through 2018.76 has an inconsistent failure delay that may lead to revealing valid usernames,…
    CVE-2017-2659 (CVSS 5.3) — It was found that dropbear before version 2013.59 with GSSAPI leaks whether given username is valid or invalid…
    CVE-2018-15599 (CVSS 5.3) — The recv_msg_userauth_request function in svr-auth.c in Dropbear through 2018.76 is prone to a user enumeratio…
    CVE-2017-9079 (CVSS 4.7) — Dropbear before 2017.75 might allow local users to read certain files as root, if the file has the authorized_…
    CVE-2017-9078 (CVSS 8.8) — The server in Dropbear before 2017.75 might allow post-authentication root remote code execution because of a …
    CVE-2016-7408 (CVSS 8.8) — The dbclient in Dropbear SSH before 2016.74 allows remote attackers to execute arbitrary code via a crafted (1…

    References

    http://lists.fedoraproject.org/pipermail/package-announce/2013-October/119300.html
    http://lists.fedoraproject.org/pipermail/package-announce/2013-October/119323.html
    http://lists.opensuse.org/opensuse-updates/2013-10/msg00061.html
    http://lists.opensuse.org/opensuse-updates/2013-11/msg00046.html
    http://secunia.com/advisories/55173
    http://www.openwall.com/lists/oss-security/2013/10/11/4
    http://www.securityfocus.com/bid/62958
    https://matt.ucc.asn.au/dropbear/CHANGES
    https://secure.ucc.asn.au/hg/dropbear/rev/0bf76f54de6f
    https://support.citrix.com/article/CTX216642
    http://lists.fedoraproject.org/pipermail/package-announce/2013-October/119300.html
    http://lists.fedoraproject.org/pipermail/package-announce/2013-October/119323.html
    http://lists.opensuse.org/opensuse-updates/2013-10/msg00061.html
    http://lists.opensuse.org/opensuse-updates/2013-11/msg00046.html
    http://secunia.com/advisories/55173
    http://www.openwall.com/lists/oss-security/2013/10/11/4
    http://www.securityfocus.com/bid/62958
    https://matt.ucc.asn.au/dropbear/CHANGES
    https://secure.ucc.asn.au/hg/dropbear/rev/0bf76f54de6f
    https://support.citrix.com/article/CTX216642

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High