Description
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 in the client memory.
Published: 2019-03-20
Score: 9.1 Critical
EPSS: 1.2% Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-1730-1 libssh2 security update
Debian DLA Debian DLA DLA-1730-2 libssh2 regression update
Debian DLA Debian DLA DLA-1730-3 libssh2 regression update
Debian DSA Debian DSA DSA-4431-1 libssh2 security update
EUVD EUVD EUVD-2019-13473 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 in the client memory.
Ubuntu USN Ubuntu USN USN-5308-1 libssh2 vulnerabilities
References
Link Providers
http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.html cve-icon cve-icon
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.html cve-icon cve-icon
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00102.html cve-icon cve-icon
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00103.html cve-icon cve-icon
http://packetstormsecurity.com/files/152136/Slackware-Security-Advisory-libssh2-Updates.html cve-icon cve-icon
http://www.openwall.com/lists/oss-security/2019/03/18/3 cve-icon cve-icon
http://www.securityfocus.com/bid/107485 cve-icon cve-icon
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3859 cve-icon cve-icon
https://lists.debian.org/debian-lts-announce/2019/03/msg00032.html cve-icon cve-icon
https://lists.debian.org/debian-lts-announce/2019/04/msg00006.html cve-icon cve-icon
https://lists.debian.org/debian-lts-announce/2019/07/msg00024.html cve-icon cve-icon
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5DK6VO2CEUTAJFYIKWNZKEKYMYR3NO2O/ cve-icon cve-icon
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XCWEA5ZCLKRDUK62QVVYMFWLWKOPX3LO/ cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2019-3859 cve-icon
https://seclists.org/bugtraq/2019/Apr/25 cve-icon cve-icon
https://seclists.org/bugtraq/2019/Mar/25 cve-icon cve-icon
https://security.netapp.com/advisory/ntap-20190327-0005/ cve-icon cve-icon
https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2019-767 cve-icon cve-icon
https://www.cve.org/CVERecord?id=CVE-2019-3859 cve-icon
https://www.debian.org/security/2019/dsa-4431 cve-icon cve-icon
https://www.libssh2.org/CVE-2019-3859.html cve-icon cve-icon cve-icon
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html cve-icon cve-icon
History

Thu, 18 Dec 2025 12:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Subscriptions

Debian Debian Linux
Fedoraproject Fedora
Libssh2 Libssh2
Netapp Ontap Select Deploy Administration Utility
Opensuse Leap
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2025-12-18T11:43:47.109Z

Reserved: 2019-01-03T00:00:00.000Z

Link: CVE-2019-3859

cve-icon Vulnrichment

Updated: 2024-08-04T19:19:18.624Z

cve-icon NVD

Status : Modified

Published: 2019-03-21T16:01:04.843

Modified: 2025-12-18T12:15:53.867

Link: CVE-2019-3859

cve-icon Redhat

Severity : Moderate

Publid Date: 2019-03-13T00:00:00Z

Links: CVE-2019-3859 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses