High 8.6Published May 19, 2021

CVE-2021-3517There is a flaw in the xml entity encoding functionality of libxml2 in versions before 2.9.11.

Updated under an hour ago (2026-10-19 05:50 UTC)

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It affects Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and 30 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP

Exploited in the last 30 days

There is a flaw in the xml entity encoding functionality of libxml2 in versions before 2.9.11. An attacker who is able to supply a crafted file to be processed by an application linked with the affected functionality of libxml2 could trigger an out-of-bounds read. The most likely impact of this flaw is to application availability, with some potential impact to confidentiality and integrity if an attacker is able to use memory information to further exploit the application.

CVSS: 8.6 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Weakness (CWE): CWE-787, CWE-125
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: redhat
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.0 before V3.1.5	CISA ADP
xmlsoft libxml2 xmlsoft:libxml2	before 2.9.11	NVD
redhat jboss_core_services redhat:jboss_core_services	all versions	NVD
redhat enterprise_linux redhat:enterprise_linux	8.0	NVD
fedoraproject fedora fedoraproject:fedora	33; 34	NVD
debian debian_linux debian:debian_linux	9.0	NVD
netapp active_iq_unified_manager netapp:active_iq_unified_manager	all versions; all versions	NVD
netapp clustered_data_ontap netapp:clustered_data_ontap	all versions	NVD
netapp clustered_data_ontap_antivirus_connector netapp:clustered_data_ontap_antivirus_connector	all versions	NVD
netapp e-series_santricity_os_controller netapp:e-series_santricity_os_controller	from 11.0.0 through 11.70.1	NVD
netapp e-series_santricity_storage_manager netapp:e-series_santricity_storage_manager	all versions	NVD
netapp e-series_santricity_web_services netapp:e-series_santricity_web_services	all versions	NVD
netapp hci_management_node netapp:hci_management_node	all versions	NVD
netapp manageability_software_development_kit netapp:manageability_software_development_kit	all versions	NVD
netapp oncommand_insight netapp:oncommand_insight	all versions	NVD
netapp oncommand_workflow_automation netapp:oncommand_workflow_automation	all versions	NVD
netapp ontap_select_deploy_administration_utility netapp:ontap_select_deploy_administration_utility	all versions	NVD
netapp santricity_unified_manager netapp:santricity_unified_manager	all versions	NVD
netapp snapdrive netapp:snapdrive	all versions	NVD
netapp snapmanager netapp:snapmanager	all versions; all versions	NVD
netapp solidfire netapp:solidfire	all versions	NVD
netapp hci_h410c_firmware netapp:hci_h410c_firmware	all versions	NVD
oracle communications_cloud_native_core_network_function_cloud_native_environment oracle:communications_cloud_native_core_network_function_cloud_native_environment	1.10.0	NVD
oracle enterprise_manager_base_platform oracle:enterprise_manager_base_platform	13.4.0.0; 13.5.0.0	NVD
oracle mysql_workbench oracle:mysql_workbench	through 8.0.26	NVD
oracle openjdk oracle:openjdk	8	NVD
oracle peoplesoft_enterprise_peopletools oracle:peoplesoft_enterprise_peopletools	8.58	NVD
oracle real_user_experience_insight oracle:real_user_experience_insight	13.4.1.0; 13.5.1.0	NVD
oracle zfs_storage_appliance_kit oracle:zfs_storage_appliance_kit	8.8	NVD

References

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QVM4UJ3376I6ZVOYMHBNX4GY3NIV52WV/vendor-advisory, x-refsource-fedora
https://lists.debian.org/debian-lts-announce/2021/05/msg00008.htmlmailing-list, x-refsource-mlist, third-party-advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1954232x-refsource-misc, issue-tracking, patch, third-party-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BZOMV5J4PMZAORVT64BKLV6YIZAFDGX6/vendor-advisory, x-refsource-fedora
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3Emailing-list, x-refsource-mlist
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3Emailing-list, x-refsource-mlist
https://security.gentoo.org/glsa/202107-05vendor-advisory, x-refsource-gentoo, third-party-advisory
https://security.netapp.com/advisory/ntap-20210625-0002/x-refsource-confirm, third-party-advisory
https://www.oracle.com/security-alerts/cpuoct2021.htmlx-refsource-misc, patch, third-party-advisory
https://www.oracle.com/security-alerts/cpujan2022.htmlx-refsource-misc, patch, third-party-advisory
https://security.netapp.com/advisory/ntap-20211022-0004/x-refsource-confirm, third-party-advisory
https://www.oracle.com/security-alerts/cpuapr2022.htmlx-refsource-misc, patch, third-party-advisory
https://www.oracle.com/security-alerts/cpujul2022.htmlx-refsource-misc, not-applicable
https://cert-portal.siemens.com/productcert/html/ssa-398330.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.