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Fencer Vulns
high 8.1

CVE-2019-17498 json

In libssh2 v1.9.0 and earlier versions, the `SSH_MSG_DISCONNECT` logic in packet.c has an integer...

published 2019-10-21 7 y ago modified 2026-10-14 26 d ago also EUVD-2019-7852 , JLSEC-2025-188

cvss
8.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.8%
EPSS 3.8% chance of exploitation in 30 days, percentile 90%
public exploits
0
none known

Summary

In libssh2 v1.9.0 and earlier versions, the SSH_MSG_DISCONNECT logic in packet.c has an integer overflow in a bounds check, enabling an attacker to specify an arbitrary (out-of-bounds) offset for a subsequent memory read. A crafted SSH server may be able to disclose sensitive information or cause a denial of service condition on the client system when a user connects to the server.

Patch / fix

  • julia LibSSH2_jll 1.10.1+0
  • 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 1.9.0-1

debian advisories DEBIAN-CVE-2019-17498

  • 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-2019-17498

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

  • libssh2 RHEL 7 1.8.0-4.el7

red hat advisories RHSA-2020:3915

  • libssh2_org SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES for SAP 15 SP1 +21 more 1.11.0-150000.4.19.1
  • libssh2_org SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 1.11.0-29.6.1
  • 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 Module for Basesystem 15, SLE High Performance Computing 15-ESPOS, SLES for SAP 15 +2 more 1.8.0-4.10.1
  • libssh2_org SLE Point of Sale 11 SP3 1.2.9-4.2.12.18.1
  • libssh2_org SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +17 more 1.4.3-20.14.1
  • libssh2_org SLES 11 SP4-LTSS 1.4.3-17.12.1

suse advisories SUSE-RU-2023:4192-1SUSE-RU-2023:4066-1SUSE-SU-2020:3551-1SUSE-SU-2019:2900-2SUSE-SU-2019:14226-1SUSE-SU-2019:2936-1

  • 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 15.1 1.8.0-lp151.6.3.1

opensuse advisories openSUSE-SU-2024:10999-1openSUSE-SU-2020:2129-1openSUSE-SU-2020:2126-1openSUSE-SU-2019:2483-1

  • libssh2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +13 more 1.9.0-r1

alpine advisories ALPINE-CVE-2019-17498

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 CBL-Mariner 2.0 1.9.0-1

azure linux advisories AZL-6650

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • libssh2 Arch Linux 1.9.0-3

arch linux advisories AVG-1690

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-2019-17498 updated cvss 6.5

libssh2: integer overflow in SSH_MSG_DISCONNECT logic in packet.c

  • Red Hat Enterprise Linux 6 libssh2
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 Advanced Virtualization libssh2
    affected: no fix planned “Will not fix”
  • Red Hat OpenShift Do 1 openshiftdo/odo-init-image-rhel7 1.1.3-2
    fixed: vendor fix RHSA-2021:0949
  • Red Hat Enterprise Linux Client (v. 7) libssh2 1.8.0-4.el7 Red Hat Enterprise Linux Client Optional (v. 7) libssh2-docs 1.8.0-4.el7, libssh2-devel 1.8.0-4.el7, libssh2-debuginfo 1.8.0-4.el7 Red Hat Enterprise Linux ComputeNode (v. 7) libssh2 1.8.0-4.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) libssh2-docs 1.8.0-4.el7, libssh2-devel 1.8.0-4.el7, libssh2-debuginfo 1.8.0-4.el7 Red Hat Enterprise Linux Server (v. 7) libssh2 1.8.0-4.el7 Red Hat Enterprise Linux Server Optional (v. 7) libssh2-docs 1.8.0-4.el7, libssh2-devel 1.8.0-4.el7, libssh2-debuginfo 1.8.0-4.el7
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 7) libssh2 1.8.0-4.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) libssh2-docs 1.8.0-4.el7, libssh2-devel 1.8.0-4.el7, libssh2-debuginfo 1.8.0-4.el7
    fixed: vendor fix RHSA-2020:3915
  • Red Hat Enterprise Linux 8 libssh2
    not affected: vulnerable code not present

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 8.1

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

Exploit prediction

3.81% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/libssh2/libssh2/blob/42d37aa63129a1b2644bf6495198923534322d64/src/packet.c#L480 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/kevinbackhouse/SecurityExploits/tree/8cbdbbe6363510f7d9ceec685373da12e6fc752d/libssh2/out_of_bounds_read_disconnect_CVE-2019-17498 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:P/I:N/A:P
OSV 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

Affected packages

ecosystem package affected fixed in
julia LibSSH2_jll
<1.10.1+0
1.10.1+0

Affected products

  • 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
  • CWE-190 Integer Overflow or Wraparound

References

Sources

Fencer Vulns 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.