Medium 5.0Published Mar 25, 2019

CVE-2019-3861An 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.

Updated under an hour ago (Oct 26, 2026, 7:10 PM ET)

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It affects The libssh2 Project libssh2 and 7 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for The libssh2 Project libssh2

Exploited in the last 30 days

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: 5.0 MEDIUM (v3.0, CNA)CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
Weakness (CWE): CWE-125
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: redhat
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

The libssh2 Project libssh2 libssh2_project:libssh2 (from the name)	1.8.1	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
libssh2 libssh2 libssh2:libssh2	from 0.15 through 1.8.0	NVD
debian debian_linux debian:debian_linux	8.0	NVD
netapp ontap_select_deploy_administration_utility netapp:ontap_select_deploy_administration_utility	all versions	NVD
opensuse leap opensuse:leap	15.0; 42.3	NVD

References

References

https://www.libssh2.org/CVE-2019-3861.html	x-refsource-misc, patch, vendor-advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3861	x-refsource-confirm, issue-tracking, patch, third-party-advisory
https://lists.debian.org/debian-lts-announce/2019/03/msg00032.html	mailing-list, x-refsource-mlist, third-party-advisory
https://security.netapp.com/advisory/ntap-20190327-0005/	x-refsource-confirm, third-party-advisory
http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.html	vendor-advisory, x-refsource-suse, mailing-list, third-party-advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.html	vendor-advisory, x-refsource-suse, third-party-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5DK6VO2CEUTAJFYIKWNZKEKYMYR3NO2O/	vendor-advisory, x-refsource-fedora
https://www.debian.org/security/2019/dsa-4431	vendor-advisory, x-refsource-debian
https://seclists.org/bugtraq/2019/Apr/25	mailing-list, x-refsource-bugtraq
https://access.redhat.com/errata/RHSA-2019:2136	vendor-advisory, x-refsource-redhat
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.