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Vulnerability record · CVE-2019-3857 · published 25 March 2019

CVE-2019-3857: Libssh2 integer overflow vulnerability

LLibssh2 · Libssh2

An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way SSH_MSG_CHANNEL_REQUEST packets with an exit signal are parsed. 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.

8.8 CVSS 3.1 High EPSS 6.1% · top 6.8% CWE-190 · Integer overflowCWE-787 · Out-of-bounds write
8.8CVSS 3.1 base score, v2 6.8
6.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
13Affected product versions listed by NVD
32References
17 Jun 2026Last modified by NVD

Description

An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way SSH_MSG_CHANNEL_REQUEST packets with an exit signal are parsed. 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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

13 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-2019:0679 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1175 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1652 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1791 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1943 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2399 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3857 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 Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20190327-0005/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4431 Third Party Advisory
https://www.libssh2.org/CVE-2019-3857.html PatchVendor Advisory
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html PatchThird Party Advisory
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-2019:0679 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1175 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1652 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1791 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1943 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2399 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3857 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 Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20190327-0005/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4431 Third Party Advisory
https://www.libssh2.org/CVE-2019-3857.html PatchVendor Advisory
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html PatchThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-3857), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.