HOMEVULNERABILITIESCVE-2019-3863
HIGH

CVE-2019-3863

CWE-190Published: March 25, 2019· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

A flaw was found in libssh2 before 1.8.1 creating a vulnerability on the SSH client side. A server could send a multiple keyboard interactive response messages whose total length are greater than unsigned char max characters. This value is used by the SSH client as an index to copy memory causing in an out of bounds memory write error.

NVD Source

Technical Analysis

CVE-2019-3863 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected Vendors & Products

Debian1 product(s)
debian linux
libssh21 product(s)
libssh2
netapp1 product(s)
ontap select deploy administration utility
openSUSE1 product(s)
leap
Red Hat6 product(s)
enterprise linux desktopenterprise linux serverenterprise linux server ausenterprise linux server eusenterprise linux server tusenterprise linux workstation
Source: NVD CPE · 11 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3863
PATCHhttps://www.libssh2.org/CVE-2019-3863.html
PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3863
PATCHhttps://www.libssh2.org/CVE-2019-3863.html
ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.html
ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.html
ADVISORYhttps://access.redhat.com/errata/RHSA-2019:0679
ADVISORYhttps://lists.debian.org/debian-lts-announce/2019/03/msg00032.html
ADVISORYhttps://security.netapp.com/advisory/ntap-20190327-0005/
ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.html
ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.html
ADVISORYhttps://access.redhat.com/errata/RHSA-2019:0679
ADVISORYhttps://lists.debian.org/debian-lts-announce/2019/03/msg00032.html
ADVISORYhttps://security.netapp.com/advisory/ntap-20190327-0005/

All References (32)

→
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
→
https://access.redhat.com/errata/RHSA-2019:0679Third Party Advisory
→
https://access.redhat.com/errata/RHSA-2019:1175
→
https://access.redhat.com/errata/RHSA-2019:1652
→
https://access.redhat.com/errata/RHSA-2019:1791
→
https://access.redhat.com/errata/RHSA-2019:1943
→
https://access.redhat.com/errata/RHSA-2019:2399
→
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3863Issue 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://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-2019-3863.htmlPatch · Vendor Advisory

Quick Facts

CVE IDCVE-2019-3863
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-190
CISA KEVNo
Affected5 vendor(s)
PublishedMar 25, 2019

Related CVEs (CWE-190)

CVE-2013-2555
10.0
CVE-2010-3254
10.0
CVE-2010-1233
10.0
CVE-2015-5108
10.0
CVE-2015-5097
10.0
CVE-2012-5835
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-3863 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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