High 8.8Published May 18, 2021

CVE-2021-3518There's a flaw in libxml2 in versions before 2.9.11.

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

Does this affect you?

It affects Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and 20 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's a flaw in libxml2 in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by an application linked with libxml2 could trigger a use-after-free. The greatest impact from this flaw is to confidentiality, integrity, and availability.

CVSS: 8.8 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
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
debian debian_linux debian:debian_linux	9.0	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
netapp active_iq_unified_manager netapp:active_iq_unified_manager	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 manageability_software_development_kit netapp:manageability_software_development_kit	all versions	NVD
netapp ontap_select_deploy_administration_utility netapp:ontap_select_deploy_administration_utility	all versions	NVD
netapp snapdrive netapp:snapdrive	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 enterprise_manager_ops_center oracle:enterprise_manager_ops_center	12.4.0.0	NVD
oracle mysql_workbench oracle:mysql_workbench	through 8.0.26	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

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=1954242x-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
http://seclists.org/fulldisclosure/2021/Jul/58mailing-list, x-refsource-fulldisc, third-party-advisory
http://seclists.org/fulldisclosure/2021/Jul/54mailing-list, x-refsource-fulldisc, third-party-advisory
http://seclists.org/fulldisclosure/2021/Jul/55mailing-list, x-refsource-fulldisc, third-party-advisory
http://seclists.org/fulldisclosure/2021/Jul/59mailing-list, x-refsource-fulldisc, third-party-advisory
https://www.oracle.com/security-alerts/cpuoct2021.htmlx-refsource-misc, patch, third-party-advisory
https://support.apple.com/kb/HT212605x-refsource-confirm, third-party-advisory
https://support.apple.com/kb/HT212602x-refsource-confirm, third-party-advisory
https://support.apple.com/kb/HT212601x-refsource-confirm, third-party-advisory
https://support.apple.com/kb/HT212604x-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.