CVE-2019-3859

Name: CVE-2019-3859
Creator: NVD / NIST
Published: 2019-03-21T16:01:04.843+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 6.28%

Last modified Jun 17, 2026

CVE-2019-3859 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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.. EPSS estimates a 6.28% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.1/10

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

EPSS Probability

6.28%

92.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Libssh2	Libssh2	< 1.8.1
Fedoraproject	Fedora	28
Fedoraproject	Fedora	29
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0
Netapp	Ontap Select Deploy Administration Utility	All versions
Opensuse	Leap	15.0
Opensuse	Leap	42.3

References

http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00102.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00103.htmlMailing List, Third Party Advisory
http://packetstormsecurity.com/files/152136/Slackware-Security-Advisory-libssh2-Updates.htmlPatch, Third Party Advisory, VDB Entry
http://www.openwall.com/lists/oss-security/2019/03/18/3Mailing List, Patch, Third Party Advisory
http://www.securityfocus.com/bid/107485Third Party Advisory, VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3859Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/03/msg00032.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/04/msg00006.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/07/msg00024.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5DK6VO2CEUTAJFYIKWNZKEKYMYR3NO2O/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XCWEA5ZCLKRDUK62QVVYMFWLWKOPX3LO/
https://seclists.org/bugtraq/2019/Apr/25Mailing List, Third Party Advisory
https://seclists.org/bugtraq/2019/Mar/25Mailing List, Patch, Third Party Advisory
https://security.netapp.com/advisory/ntap-20190327-0005/Third Party Advisory
https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2019-767Third Party Advisory
https://www.debian.org/security/2019/dsa-4431Third Party Advisory
https://www.libssh2.org/CVE-2019-3859.htmlVendor Advisory
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00102.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00103.htmlMailing List, Third Party Advisory
http://packetstormsecurity.com/files/152136/Slackware-Security-Advisory-libssh2-Updates.htmlPatch, Third Party Advisory, VDB Entry
http://www.openwall.com/lists/oss-security/2019/03/18/3Mailing List, Patch, Third Party Advisory
http://www.securityfocus.com/bid/107485Third Party Advisory, VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3859Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/03/msg00032.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/04/msg00006.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/07/msg00024.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5DK6VO2CEUTAJFYIKWNZKEKYMYR3NO2O/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XCWEA5ZCLKRDUK62QVVYMFWLWKOPX3LO/
https://seclists.org/bugtraq/2019/Apr/25Mailing List, Third Party Advisory
https://seclists.org/bugtraq/2019/Mar/25Mailing List, Patch, Third Party Advisory
https://security.netapp.com/advisory/ntap-20190327-0005/Third Party Advisory
https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2019-767Third Party Advisory
https://www.debian.org/security/2019/dsa-4431Third Party Advisory
https://www.libssh2.org/CVE-2019-3859.htmlVendor Advisory
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html

Timeline

Published: Mar 21, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-3859?

How severe is CVE-2019-3859?

CVE-2019-3859 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 6.28% probability of exploitation in the next 30 days.

How do I fix CVE-2019-3859?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-3859?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST