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    CVE-2019-3863

    A flaw was found in libssh2 before 1.8.1 creating a vulnerability on the SSH client side. A server could send a multiple keyboard interactive response messages whose total length are greater than unsigned char max characters. This value is used by the SSH client as an index to copy memory causing in an out of bounds memory write error.

    Published:Mar 13, 2019
    Last Modified:Dec 19, 2025
    EPS:Mar 25, 2019
    EPSS Score:0.08763
    CVSS Score:7.5

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Libssh2
    Product
    Libssh2
    Vendor
    Netapp
    Product
    Ontap Select Deploy Administration Utility
    Vendor
    Opensuse
    Product
    Leap
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Enterprise Linux Desktop
    Vendor
    Redhat
    Product
    Enterprise Linux Server
    Vendor
    Redhat
    Product
    Enterprise Linux Server Aus
    Vendor
    Redhat
    Product
    Enterprise Linux Server Eus
    Vendor
    Redhat
    Product
    Enterprise Linux Server Tus
    Vendor
    Redhat
    Product
    Enterprise Linux Workstation
    Vendor
    Redhat
    Product
    Rhel Aus
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Tus

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

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    References

    http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.html
    http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.html
    https://access.redhat.com/errata/RHSA-2019:0679
    https://access.redhat.com/errata/RHSA-2019:1175
    https://access.redhat.com/errata/RHSA-2019:1652
    https://access.redhat.com/errata/RHSA-2019:1791
    https://access.redhat.com/errata/RHSA-2019:1943
    https://access.redhat.com/errata/RHSA-2019:2399
    https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3863
    https://lists.debian.org/debian-lts-announce/2019/03/msg00032.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5DK6VO2CEUTAJFYIKWNZKEKYMYR3NO2O/
    https://seclists.org/bugtraq/2019/Apr/25
    https://security.netapp.com/advisory/ntap-20190327-0005/
    https://www.debian.org/security/2019/dsa-4431
    https://www.libssh2.org/CVE-2019-3863.html
    https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
    http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.html
    http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.html
    https://access.redhat.com/errata/RHSA-2019:0679
    https://access.redhat.com/errata/RHSA-2019:1175
    https://access.redhat.com/errata/RHSA-2019:1652
    https://access.redhat.com/errata/RHSA-2019:1791
    https://access.redhat.com/errata/RHSA-2019:1943
    https://access.redhat.com/errata/RHSA-2019:2399
    https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3863
    https://lists.debian.org/debian-lts-announce/2019/03/msg00032.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5DK6VO2CEUTAJFYIKWNZKEKYMYR3NO2O/
    https://seclists.org/bugtraq/2019/Apr/25
    https://security.netapp.com/advisory/ntap-20190327-0005/
    https://www.debian.org/security/2019/dsa-4431
    https://www.libssh2.org/CVE-2019-3863.html
    https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html

    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