--- id: CVE-2019-3858 title: >- An out of bounds read flaw was discovered in libssh2 before 1.8.1 when a specially crafted SFTP packet is received from the server summary: >- An out of bounds read flaw was discovered in libssh2 before 1.8.1 when a specially crafted SFTP packet is received from the server. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in t… severity: medium cvss: 5 cvssVector: 'CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L' cwe: - CWE-125 vendor: libssh2 product: libssh2 affected: - libssh2 < 1.8.1 - fedora = 29 - debian_linux = 8.0 - 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: '2026-10-14T07:16:52.143' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2019-3858' 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://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-2019:2136' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3858' 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/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-2019-3858.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://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-2019:2136' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3858' 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/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-2019-3858.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 - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2019/cve-2019-3858.json - url: 'https://access.redhat.com/security/cve/CVE-2019-3858' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=1687306' - url: 'https://www.cve.org/CVERecord?id=CVE-2019-3858' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2019-3858' - url: 'https://access.redhat.com/errata/RHBA-2020:0547' tags: - nvd - csaf - vex - red-hat epss: 0.06448 epssPercentile: 0.93587 ingestedAt: '2026-10-14T07:21:04.808Z' --- ## Overview An out of bounds read flaw was discovered in libssh2 before 1.8.1 when a specially crafted SFTP packet is received from the server. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory. ## Affected - `libssh2 < 1.8.1` - `fedora = 29` - `debian_linux = 8.0` - `ontap_select_deploy_administration_utility` - `leap = 15.0` - `leap = 42.3` ## Remediation Upgrade past the affected range: - `libssh2 1.8.1` ## Vendor advisories - **RHSA-2019:2136** · Red Hat · fixed in: Red Hat Enterprise Linux Client (v. 7), Red Hat Enterprise Linux Client Optional (v. 7), Red Hat Enterprise Linux ComputeNode (v. 7), Red Hat Enterprise Linux ComputeNode Optional (v. 7), Red Hat Enterprise Linux Server (v. 7), Red Hat Enterprise Linux Server Optional (v. 7), … · released 2019-08-06 · [advisory](https://access.redhat.com/errata/RHSA-2019:2136) - **RHBA-2020:0547** · Red Hat · fixed in: Red Hat Ansible Tower 3.4 for RHEL 7 Server · released 2020-02-18 · [advisory](https://access.redhat.com/errata/RHBA-2020:0547) - **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 8 Advanced Virtualization, Red Hat Virtualization 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 8 Advanced Virtualization, Red Hat Virtualization 4 · updated 2026-10-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2019/cve-2019-3858.json)