{"id":"CVE-2019-3859","title":"An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the _libssh2_packet_require and _libssh2_packet_requirev functions","summary":"An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the _libssh2_packet_require and _libssh2_packet_requirev functions. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","cwe":["CWE-125","CWE-125","CWE-125"],"vendor":"libssh2","product":"libssh2","affected":["libssh2 < 1.8.1","fedora = 28","fedora = 29","debian_linux = 8.0","debian_linux = 9.0","ontap_select_deploy_administration_utility","leap = 15.0","leap = 42.3"],"patched":["libssh2 1.8.1"],"published":"2019-03-21","updated":"2026-10-14","sourceUpdated":"2026-10-14T07:16:52.390","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2019-3859","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://lists.opensuse.org/opensuse-security-announce/2019-04/msg00102.html","label":"secalert@redhat.com"},{"url":"http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00103.html","label":"secalert@redhat.com"},{"url":"http://packetstormsecurity.com/files/152136/Slackware-Security-Advisory-libssh2-Updates.html","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://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3859","label":"secalert@redhat.com"},{"url":"https://lists.debian.org/debian-lts-announce/2019/03/msg00032.html","label":"secalert@redhat.com"},{"url":"https://lists.debian.org/debian-lts-announce/2019/04/msg00006.html","label":"secalert@redhat.com"},{"url":"https://lists.debian.org/debian-lts-announce/2019/07/msg00024.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/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://security.netapp.com/advisory/ntap-20190327-0005/","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-2019-3859.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://lists.opensuse.org/opensuse-security-announce/2019-04/msg00102.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00103.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://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://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3859","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.debian.org/debian-lts-announce/2019/04/msg00006.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2019/07/msg00024.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/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://security.netapp.com/advisory/ntap-20190327-0005/","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-2019-3859.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":0.06275,"epssPercentile":0.93436,"ingestedAt":"2026-10-14T07:21:04.807Z","slug":"CVE-2019-3859","body":"## Overview\n\nAn out of bounds read flaw was discovered in libssh2 before 1.8.1 in the _libssh2_packet_require and _libssh2_packet_requirev functions. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory.\n\n## Affected\n\n- `libssh2 < 1.8.1`\n- `fedora = 28`\n- `fedora = 29`\n- `debian_linux = 8.0`\n- `debian_linux = 9.0`\n- `ontap_select_deploy_administration_utility`\n- `leap = 15.0`\n- `leap = 42.3`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `libssh2 1.8.1`","depth":"midnight","depthScore":51,"depthScoreParts":{"impact":50.1,"likelihood":1.3,"exploitation":0,"ransomware":0},"changes":[]}