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Fencer Intel
high 7.5

CVE-2019-3863 json

A flaw was found in libssh2 before 1.8.1 creating a vulnerability on the SSH client side.

published 7y ago modified 26d ago also EUVD-2019-13477

cvss
7.5
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.4%
EPSS 3.4% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

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.

Patch / fix

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP V3.1.5
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • libssh2 Debian 14, Debian 13, Debian 12 1.8.0-2.1

debian advisories DEBIAN-CVE-2019-3863

  • libssh2 Ubuntu Pro 14.04 LTS 1.4.3-2ubuntu0.2+esm2
  • libssh2 Ubuntu Pro 16.04 LTS 1.5.0-2ubuntu0.1+esm1

ubuntu advisories UBUNTU-CVE-2019-3863

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • SLOF RHEL 8 20171214-5.gitfa98132.module+el8.0.0+3075+09be6b65
  • hivex RHEL 8 1.3.15-6.module+el8.0.0+3075+09be6b65
  • netcf RHEL 8 0.2.8-10.module+el8.0.0+3075+09be6b65
  • nbdkit RHEL 8 1.4.2-4.module+el8.0.0+3075+09be6b65
  • libssh2 RHEL 8 1.8.0-7.module+el8.0.0+3075+09be6b65.1
  • libvirt RHEL 8 4.5.0-23.1.module+el8.0.0+3151+3ba813f9
  • seabios RHEL 8 1.11.1-3.module+el8.0.0+3075+09be6b65
  • sgabios RHEL 8 1:0.20170427git-2.module+el8.0.0+3075+09be6b65

red hat advisories RHSA-2019:1175RHSA-2019:2399RHSA-2019:1943RHSA-2019:1652RHSA-2019:1791RHSA-2019:0679

  • libssh2_org SLES for SAP 15, SLES 15-LTSS, SLE Module for Basesystem 15 SP2 +3 more 1.9.0-4.13.1
  • libssh2_org SLE Point of Sale 11 SP3 1.2.9-4.2.12.5.1
  • libssh2_org SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES for SAP 12 SP2 +13 more 1.4.3-20.3.1
  • libssh2_org SLES for SAP 11 SP4, SLES 11 SP4, SLE Software Development Kit 11 SP4 1.4.3-17.3.1

suse advisories SUSE-SU-2020:3551-1SUSE-SU-2019:13997-1SUSE-SU-2019:0655-1SUSE-SU-2019:13982-1

  • libssh2_org openSUSE Tumbleweed 1.9.0-3.6
  • libssh2_org openSUSE Leap 15.2 1.9.0-lp152.8.3.1
  • libssh2_org openSUSE Leap 15.1 1.9.0-lp151.6.6.1
  • libssh2_org openSUSE Leap 15.0 1.8.0-lp150.3.3.1

opensuse advisories openSUSE-SU-2024:10999-1openSUSE-SU-2020:2129-1openSUSE-SU-2020:2126-1openSUSE-SU-2019:1109-1

  • libssh2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +13 more 1.8.1-r0

alpine advisories ALPINE-CVE-2019-3863

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libssh2 Arch Linux 1.8.1-1

arch linux advisories AVG-926

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-3863 updated cvss 7.5

libssh2: Integer overflow in user authenticate keyboard interactive allows out-of-bounds writes

  • Red Hat Enterprise Linux 8 Advanced Virtualization libssh2
    affected: no fix available
  • Red Hat Virtualization 4 rhvm-appliance, redhat-virtualization-host-image-update
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux AppStream (v. 8) hivex 1.3.15-6.module+el8.0.0+3075+09be6b65, nbdkit 1.4.2-4.module+el8.0.0+3075+09be6b65, netcf 0.2.8-10.module+el8.0.0+3075+09be6b65, seabios 1.11.1-3.module+el8.0.0+3075+09be6b65, libiscsi 1.18.0-6.module+el8.0.0+3075+09be6b65, libssh2 1.8.0-7.module+el8.0.0+3075+09be6b65.1, +82 more
    fixed: vendor fix RHSA-2019:1175
  • Red Hat Enterprise Linux Client (v. 7) libssh2 1.4.3-12.el7_6.2 Red Hat Enterprise Linux Client Optional (v. 7) libssh2-docs 1.4.3-12.el7_6.2, libssh2-devel 1.4.3-12.el7_6.2, libssh2-debuginfo 1.4.3-12.el7_6.2 Red Hat Enterprise Linux ComputeNode (v. 7) libssh2 1.4.3-12.el7_6.2
    fixed: vendor fix RHSA-2019:0679
  • Red Hat Enterprise Linux ComputeNode EUS (v. 7.4) libssh2 1.4.3-11.el7_4.1
    fixed: vendor fix RHSA-2019:1943
  • Red Hat Enterprise Linux ComputeNode EUS (v. 7.5) libssh2 1.4.3-11.el7_5.1
    fixed: vendor fix RHSA-2019:1791
  • Red Hat Enterprise Linux ComputeNode Optional (v. 7) libssh2-docs 1.4.3-12.el7_6.2, libssh2-devel 1.4.3-12.el7_6.2, libssh2-debuginfo 1.4.3-12.el7_6.2
    fixed: vendor fix RHSA-2019:0679
  • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4) libssh2-docs 1.4.3-11.el7_4.1, libssh2-devel 1.4.3-11.el7_4.1, libssh2-debuginfo 1.4.3-11.el7_4.1
    fixed: vendor fix RHSA-2019:1943
show 18 more
  • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.5) libssh2-docs 1.4.3-11.el7_5.1, libssh2-devel 1.4.3-11.el7_5.1, libssh2-debuginfo 1.4.3-11.el7_5.1
    fixed: vendor fix RHSA-2019:1791
  • Red Hat Enterprise Linux Desktop (v. 6) libssh2 1.4.2-3.el6_10.1 Red Hat Enterprise Linux Desktop Optional (v. 6) libssh2-docs 1.4.2-3.el6_10.1, libssh2-devel 1.4.2-3.el6_10.1, libssh2-debuginfo 1.4.2-3.el6_10.1
    fixed: vendor fix RHSA-2019:1652
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) libssh2 1.4.3-12.el7_6.2 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) libssh2-docs 1.4.3-12.el7_6.2, libssh2-devel 1.4.3-12.el7_6.2, libssh2-debuginfo 1.4.3-12.el7_6.2
    fixed: vendor fix RHSA-2019:0679
  • Red Hat Enterprise Linux HPC Node (v. 6) libssh2 1.4.2-3.el6_10.1 Red Hat Enterprise Linux HPC Node Optional (v. 6) libssh2-docs 1.4.2-3.el6_10.1, libssh2-devel 1.4.2-3.el6_10.1, libssh2-debuginfo 1.4.2-3.el6_10.1 Red Hat Enterprise Linux Server (v. 6) libssh2 1.4.2-3.el6_10.1
    fixed: vendor fix RHSA-2019:1652
  • Red Hat Enterprise Linux Server (v. 7) libssh2 1.4.3-12.el7_6.2
    fixed: vendor fix RHSA-2019:0679
  • Red Hat Enterprise Linux Server AUS (v. 7.3) libssh2 1.4.3-11.el7_3.1 Red Hat Enterprise Linux Server E4S (v. 7.3) libssh2 1.4.3-11.el7_3.1
    fixed: vendor fix RHSA-2019:2399
  • Red Hat Enterprise Linux Server EUS (v. 7.4) libssh2 1.4.3-11.el7_4.1
    fixed: vendor fix RHSA-2019:1943
  • Red Hat Enterprise Linux Server EUS (v. 7.5) libssh2 1.4.3-11.el7_5.1
    fixed: vendor fix RHSA-2019:1791
  • Red Hat Enterprise Linux Server Optional (v. 6) libssh2-docs 1.4.2-3.el6_10.1, libssh2-devel 1.4.2-3.el6_10.1, libssh2-debuginfo 1.4.2-3.el6_10.1
    fixed: vendor fix RHSA-2019:1652
  • Red Hat Enterprise Linux Server Optional (v. 7) libssh2-docs 1.4.3-12.el7_6.2, libssh2-devel 1.4.3-12.el7_6.2, libssh2-debuginfo 1.4.3-12.el7_6.2
    fixed: vendor fix RHSA-2019:0679
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.3) libssh2-docs 1.4.3-11.el7_3.1, libssh2-devel 1.4.3-11.el7_3.1, libssh2-debuginfo 1.4.3-11.el7_3.1 Red Hat Enterprise Linux Server Optional E4S (v. 7.3) libssh2-docs 1.4.3-11.el7_3.1, libssh2-devel 1.4.3-11.el7_3.1, libssh2-debuginfo 1.4.3-11.el7_3.1
    fixed: vendor fix RHSA-2019:2399
  • Red Hat Enterprise Linux Server Optional EUS (v. 7.4) libssh2-docs 1.4.3-11.el7_4.1, libssh2-devel 1.4.3-11.el7_4.1, libssh2-debuginfo 1.4.3-11.el7_4.1
    fixed: vendor fix RHSA-2019:1943
  • Red Hat Enterprise Linux Server Optional EUS (v. 7.5) libssh2-docs 1.4.3-11.el7_5.1, libssh2-devel 1.4.3-11.el7_5.1, libssh2-debuginfo 1.4.3-11.el7_5.1
    fixed: vendor fix RHSA-2019:1791
  • Red Hat Enterprise Linux Server Optional TUS (v. 7.3) libssh2-docs 1.4.3-11.el7_3.1, libssh2-devel 1.4.3-11.el7_3.1, libssh2-debuginfo 1.4.3-11.el7_3.1 Red Hat Enterprise Linux Server TUS (v. 7.3) libssh2 1.4.3-11.el7_3.1
    fixed: vendor fix RHSA-2019:2399
  • Red Hat Enterprise Linux Workstation (v. 6) libssh2 1.4.2-3.el6_10.1
    fixed: vendor fix RHSA-2019:1652
  • Red Hat Enterprise Linux Workstation (v. 7) libssh2 1.4.3-12.el7_6.2
    fixed: vendor fix RHSA-2019:0679
  • Red Hat Enterprise Linux Workstation Optional (v. 6) libssh2-docs 1.4.2-3.el6_10.1, libssh2-devel 1.4.2-3.el6_10.1, libssh2-debuginfo 1.4.2-3.el6_10.1
    fixed: vendor fix RHSA-2019:1652
  • Red Hat Enterprise Linux Workstation Optional (v. 7) libssh2-docs 1.4.3-12.el7_6.2, libssh2-devel 1.4.3-12.el7_6.2, libssh2-debuginfo 1.4.3-12.el7_6.2
    fixed: vendor fix RHSA-2019:0679

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-23-348-10 updated cvss 8.8

Siemens SIMATIC S7-1500

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.0, < 3.1.5
    affected: fixed in V3.1.5, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
last yr.

Exploit prediction

3.44% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.0 7.5 CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 3.0 8.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • The libssh2 Project libssh2
  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.