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Vulnerability record · CVE-2019-3861 · published 25 March 2019

CVE-2019-3861: Libssh2 out-of-bounds read vulnerability

LLibssh2 · Libssh2

An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the way SSH packets with a padding length value greater than the packet length are parsed. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory.

9.1 CVSS 3.0 Critical EPSS 5.1% · top 7.9% CWE-125 · Out-of-bounds read
9.1CVSS 3.0 base score, v2 6.4
5.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
22References
17 Jun 2026Last modified by NVD

Description

An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the way SSH packets with a padding length value greater than the packet length are parsed. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.html Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2136
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3861 Issue TrackingPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/03/msg00032.html Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5DK6VO2CEUTAJFYIKWNZKEK
https://seclists.org/bugtraq/2019/Apr/25
https://security.netapp.com/advisory/ntap-20190327-0005/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4431
https://www.libssh2.org/CVE-2019-3861.html PatchVendor Advisory
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.html Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2136
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3861 Issue TrackingPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/03/msg00032.html Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5DK6VO2CEUTAJFYIKWNZKEK
https://seclists.org/bugtraq/2019/Apr/25
https://security.netapp.com/advisory/ntap-20190327-0005/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4431
https://www.libssh2.org/CVE-2019-3861.html PatchVendor Advisory
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html

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Source: NIST National Vulnerability Database (record CVE-2019-3861), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.