HOMEVULNERABILITIESCVE-2019-3857
HIGH

CVE-2019-3857

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

8.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2019-3857 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 8.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected Vendors & Products

Debian1 product(s)
debian linux
Fedora1 product(s)
fedora
libssh21 product(s)
libssh2
netapp1 product(s)
ontap select deploy administration utility
openSUSE1 product(s)
leap
Oracle1 product(s)
peoplesoft enterprise peopletools
Red Hat7 product(s)
enterprise linuxenterprise linux desktopenterprise linux serverenterprise linux server ausenterprise linux server eusenterprise linux server tusenterprise linux workstation
Source: NVD CPE · 16 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-2019-3857
PATCHhttps://www.libssh2.org/CVE-2019-3857.html
PATCHhttps://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3857
PATCHhttps://www.libssh2.org/CVE-2019-3857.html
PATCHhttps://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.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://access.redhat.com/errata/RHSA-2019:1175
ADVISORYhttps://access.redhat.com/errata/RHSA-2019:1652
ADVISORYhttps://access.redhat.com/errata/RHSA-2019:1791
ADVISORYhttps://access.redhat.com/errata/RHSA-2019:1943
ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2399
ADVISORYhttps://lists.debian.org/debian-lts-announce/2019/03/msg00032.html
ADVISORYhttps://seclists.org/bugtraq/2019/Apr/25
ADVISORYhttps://security.netapp.com/advisory/ntap-20190327-0005/
ADVISORYhttps://www.debian.org/security/2019/dsa-4431
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://access.redhat.com/errata/RHSA-2019:1175
ADVISORYhttps://access.redhat.com/errata/RHSA-2019:1652
ADVISORYhttps://access.redhat.com/errata/RHSA-2019:1791
ADVISORYhttps://access.redhat.com/errata/RHSA-2019:1943
ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2399
ADVISORYhttps://lists.debian.org/debian-lts-announce/2019/03/msg00032.html
ADVISORYhttps://seclists.org/bugtraq/2019/Apr/25
ADVISORYhttps://security.netapp.com/advisory/ntap-20190327-0005/
ADVISORYhttps://www.debian.org/security/2019/dsa-4431

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-2019:1175Third 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-2019-3857Issue Tracking · Patch · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2019/03/msg00032.htmlThird Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5DK6VO2CEUTAJFYIKWNZKEKYMYR3NO2O/
→
https://seclists.org/bugtraq/2019/Apr/25Mailing List · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20190327-0005/Third Party Advisory
→
https://www.debian.org/security/2019/dsa-4431Third Party Advisory
→
https://www.libssh2.org/CVE-2019-3857.htmlPatch · Vendor Advisory

Quick Facts

CVE IDCVE-2019-3857
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-190
CISA KEVNo
Affected7 vendor(s)
PublishedMar 25, 2019

Related CVEs (CWE-190)

CVE-2012-5143
10.0
CVE-2015-5097
10.0
CVE-2010-3254
10.0
CVE-2012-5835
10.0
CVE-2013-2555
10.0
CVE-2015-5108
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-3857 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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