--- id: CVE-2019-3855 title: >- An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way packets are read from the server summary: >- An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way packets are read from the server. A remote attacker who compromises a SSH server may be able to execute code on the cli… severity: high cvss: 8.8 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H' cwe: - CWE-190 - CWE-787 - CWE-190 - CWE-787 vendor: libssh2 product: libssh2 affected: - libssh2 < 1.8.1 - fedora = 28 - fedora = 29 - fedora = 30 - debian_linux = 8.0 - debian_linux = 9.0 - ontap_select_deploy_administration_utility - enterprise_linux = 8.0 - enterprise_linux_desktop = 7.0 - enterprise_linux_server = 7.0 - enterprise_linux_server_aus = 7.6 - enterprise_linux_server_eus = 7.6 - enterprise_linux_server_tus = 7.6 - enterprise_linux_workstation = 7.0 - leap = 42.3 - xcode < 11.0 - peoplesoft_enterprise_peopletools = 8.56 - peoplesoft_enterprise_peopletools = 8.57 patched: - libssh2 1.8.1 - xcode 11.0 published: '2019-03-21' updated: '2026-10-14' sourceUpdated: '2026-10-14T07:16:51.257' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2019-3855' references: - url: 'http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.html' label: secalert@redhat.com - url: 'http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.html' label: secalert@redhat.com - url: >- http://packetstormsecurity.com/files/152136/Slackware-Security-Advisory-libssh2-Updates.html label: secalert@redhat.com - url: 'http://seclists.org/fulldisclosure/2019/Sep/42' label: secalert@redhat.com - url: 'http://www.openwall.com/lists/oss-security/2019/03/18/3' label: secalert@redhat.com - url: 'http://www.securityfocus.com/bid/107485' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2019:0679' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2019:1175' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2019:1652' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2019:1791' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2019:1943' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2019:2399' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3855' label: secalert@redhat.com - url: 'https://lists.debian.org/debian-lts-announce/2019/03/msg00032.html' label: secalert@redhat.com - url: >- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5DK6VO2CEUTAJFYIKWNZKEKYMYR3NO2O/ label: secalert@redhat.com - url: >- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6LUNHPW64IGCASZ4JQ2J5KDXNZN53DWW/ label: secalert@redhat.com - url: >- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M7IF3LNHOA75O4WZWIHJLIRMA5LJUED3/ label: secalert@redhat.com - url: >- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XCWEA5ZCLKRDUK62QVVYMFWLWKOPX3LO/ label: secalert@redhat.com - url: 'https://seclists.org/bugtraq/2019/Apr/25' label: secalert@redhat.com - url: 'https://seclists.org/bugtraq/2019/Mar/25' label: secalert@redhat.com - url: 'https://seclists.org/bugtraq/2019/Sep/49' label: secalert@redhat.com - url: 'https://security.netapp.com/advisory/ntap-20190327-0005/' label: secalert@redhat.com - url: 'https://support.apple.com/kb/HT210609' label: secalert@redhat.com - url: >- https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2019-767 label: secalert@redhat.com - url: 'https://www.debian.org/security/2019/dsa-4431' label: secalert@redhat.com - url: 'https://www.libssh2.org/CVE-2019-3855.html' label: secalert@redhat.com - url: >- https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html label: secalert@redhat.com - url: 'http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.html' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.html' label: af854a3a-2127-422b-91ae-364da2661108 - url: >- http://packetstormsecurity.com/files/152136/Slackware-Security-Advisory-libssh2-Updates.html label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://seclists.org/fulldisclosure/2019/Sep/42' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://www.openwall.com/lists/oss-security/2019/03/18/3' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://www.securityfocus.com/bid/107485' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2019:0679' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2019:1175' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2019:1652' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2019:1791' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2019:1943' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2019:2399' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3855' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://lists.debian.org/debian-lts-announce/2019/03/msg00032.html' label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5DK6VO2CEUTAJFYIKWNZKEKYMYR3NO2O/ label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6LUNHPW64IGCASZ4JQ2J5KDXNZN53DWW/ label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M7IF3LNHOA75O4WZWIHJLIRMA5LJUED3/ label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XCWEA5ZCLKRDUK62QVVYMFWLWKOPX3LO/ label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://seclists.org/bugtraq/2019/Apr/25' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://seclists.org/bugtraq/2019/Mar/25' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://seclists.org/bugtraq/2019/Sep/49' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://security.netapp.com/advisory/ntap-20190327-0005/' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://support.apple.com/kb/HT210609' label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2019-767 label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://www.debian.org/security/2019/dsa-4431' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://www.libssh2.org/CVE-2019-3855.html' label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html' label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e tags: - nvd epss: 0.09294 epssPercentile: 0.95278 ingestedAt: '2026-10-14T07:21:04.808Z' --- ## Overview An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way packets are read from the server. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server. ## Affected - `libssh2 < 1.8.1` - `fedora = 28` - `fedora = 29` - `fedora = 30` - `debian_linux = 8.0` - `debian_linux = 9.0` - `ontap_select_deploy_administration_utility` - `enterprise_linux = 8.0` - `enterprise_linux_desktop = 7.0` - `enterprise_linux_server = 7.0` - `enterprise_linux_server_aus = 7.6` - `enterprise_linux_server_eus = 7.6` - `enterprise_linux_server_tus = 7.6` - `enterprise_linux_workstation = 7.0` - `leap = 42.3` - `xcode < 11.0` - `peoplesoft_enterprise_peopletools = 8.56` - `peoplesoft_enterprise_peopletools = 8.57` ## Remediation Upgrade past the affected range: - `libssh2 1.8.1` - `xcode 11.0`