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Fencer Vulns
high 7.5

CVE-2020-22218 json

An issue was discovered in function `_libssh2_packet_add` in libssh2 1.10.0 allows attackers to...

published 2023-08-22 3 y ago modified 2026-10-14 26 d ago also EUVD-2020-14983 , JLSEC-2025-189

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 67%
public exploits
0
none known

Summary

An issue was discovered in function _libssh2_packet_add in libssh2 1.10.0 allows attackers to access out of bounds memory.

Patch / fix

  • julia LibSSH2_jll 1.11.0+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 1.10.0-2

debian advisories DEBIAN-CVE-2020-22218

  • libssh2 Ubuntu 18.04 LTS 1.8.0-1ubuntu0.1
  • libssh2 Ubuntu 20.04 LTS 1.8.0-2.1ubuntu0.1
  • libssh2 Ubuntu Pro 14.04 LTS 1.4.3-2ubuntu0.2+esm3
  • libssh2 Ubuntu Pro 16.04 LTS 1.5.0-2ubuntu0.1+esm2

ubuntu advisories UBUNTU-CVE-2020-22218

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_9.1

red hat advisories RHSA-2023:5615

  • libssh2_org SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 1.4.3-26.5.1
  • libssh2_org SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES for SAP 15 SP1 +19 more 1.9.0-150000.4.16.1

suse advisories SUSE-SU-2023:3738-1SUSE-SU-2023:3555-1

  • libssh2 CBL-Mariner 2.0 1.9.0-3

azure linux advisories AZL-28594

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

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-2020-22218 updated cvss 7.5

libssh2: use-of-uninitialized-value in _libssh2_transport_read

  • Red Hat Enterprise Linux 6 libssh2
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux Client (v. 7) libssh2 1.8.0-4.el7_9.1 Red Hat Enterprise Linux Client Optional (v. 7) libssh2-docs 1.8.0-4.el7_9.1, libssh2-devel 1.8.0-4.el7_9.1, libssh2-debuginfo 1.8.0-4.el7_9.1 Red Hat Enterprise Linux ComputeNode Optional (v. 7) libssh2-docs 1.8.0-4.el7_9.1, libssh2-devel 1.8.0-4.el7_9.1, libssh2-debuginfo 1.8.0-4.el7_9.1 Red Hat Enterprise Linux Server (v. 7) libssh2 1.8.0-4.el7_9.1 Red Hat Enterprise Linux Server Optional (v. 7) libssh2-docs 1.8.0-4.el7_9.1, libssh2-devel 1.8.0-4.el7_9.1, libssh2-debuginfo 1.8.0-4.el7_9.1 Red Hat Enterprise Linux Workstation (v. 7) libssh2 1.8.0-4.el7_9.1
    +1 more products
    Red Hat Enterprise Linux Workstation Optional (v. 7) libssh2-docs 1.8.0-4.el7_9.1, libssh2-devel 1.8.0-4.el7_9.1, libssh2-debuginfo 1.8.0-4.el7_9.1
    fixed: vendor fix RHSA-2023:5615

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 7.5

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 ICSA-25-105-08 updated cvss 6.5

ABB M2M Gateway

  • ABB M2M Gateway >=4.1.2, <=5.0.3, >=5.0.1, <=5.0.3
    affected: mitigation

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
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

1.16% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
julia LibSSH2_jll
>=1.10.1+0, <1.11.0+0
1.11.0+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

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.