CVE-2019-3855

Name: CVE-2019-3855
Creator: NVD / NIST
Published: 2019-03-21T21:29:00.433+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 9.22%

Last modified Jun 17, 2026

CVE-2019-3855 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way packets are read from the server. 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.. EPSS estimates a 9.22% chance of exploitation in the next 30 days.

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 packets are read from the server. 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.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

9.22%

94.7th 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
Fedoraproject	Fedora	30
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0
Netapp	Ontap Select Deploy Administration Utility	All versions
Redhat	Enterprise Linux	8.0
Redhat	Enterprise Linux Desktop	7.0
Redhat	Enterprise Linux Server	7.0
Redhat	Enterprise Linux Server Aus	7.6
Redhat	Enterprise Linux Server Eus	7.6
Redhat	Enterprise Linux Server Tus	7.6
Redhat	Enterprise Linux Workstation	7.0
Opensuse	Leap	42.3
Apple	Xcode	< 11.0
Oracle	Peoplesoft Enterprise Peopletools	8.56
Oracle	Peoplesoft Enterprise Peopletools	8.57

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.htmlThird Party Advisory
http://packetstormsecurity.com/files/152136/Slackware-Security-Advisory-libssh2-Updates.htmlThird Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2019/Sep/42Mailing List, Third Party Advisory
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://access.redhat.com/errata/RHSA-2019:0679Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1175Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1652Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1791Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1943Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2399Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3855Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/03/msg00032.htmlMailing List, Third Party Advisory
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/6LUNHPW64IGCASZ4JQ2J5KDXNZN53DWW/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M7IF3LNHOA75O4WZWIHJLIRMA5LJUED3/
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, Third Party Advisory
https://seclists.org/bugtraq/2019/Sep/49Mailing List, Third Party Advisory
https://security.netapp.com/advisory/ntap-20190327-0005/Third Party Advisory
https://support.apple.com/kb/HT210609Third 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-2019-3855.htmlPatch, Vendor Advisory
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.htmlPatch, Third Party Advisory
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.htmlThird Party Advisory
http://packetstormsecurity.com/files/152136/Slackware-Security-Advisory-libssh2-Updates.htmlThird Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2019/Sep/42Mailing List, Third Party Advisory
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://access.redhat.com/errata/RHSA-2019:0679Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1175Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1652Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1791Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1943Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2399Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3855Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/03/msg00032.htmlMailing List, Third Party Advisory
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/6LUNHPW64IGCASZ4JQ2J5KDXNZN53DWW/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M7IF3LNHOA75O4WZWIHJLIRMA5LJUED3/
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, Third Party Advisory
https://seclists.org/bugtraq/2019/Sep/49Mailing List, Third Party Advisory
https://security.netapp.com/advisory/ntap-20190327-0005/Third Party Advisory
https://support.apple.com/kb/HT210609Third 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-2019-3855.htmlPatch, Vendor Advisory
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.htmlPatch, Third Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2019-3855?

How severe is CVE-2019-3855?

CVE-2019-3855 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 9.22% probability of exploitation in the next 30 days.

How do I fix CVE-2019-3855?

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-2019-3855?

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

Scan your code now

Source: NVD / NIST