High 7.8Published Jun 1, 2021

CVE-2021-3516There's a flaw in libxml2's xmllint in versions before 2.9.11.

Updated under an hour ago (Oct 26, 2026, 10:10 PM ET)

Does this affect you?

It affects Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and 11 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

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's xmllint in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by xmllint could trigger a use-after-free. The greatest impact of this flaw is to confidentiality, integrity, and availability.

CVSS: 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/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 xmllint xmlsoft:xmllint	before 2.9.11	NVD
debian debian_linux debian:debian_linux	9.0	NVD
fedoraproject fedora fedoraproject:fedora	33; 34	NVD
redhat jboss_core_services redhat:jboss_core_services	all versions	NVD
redhat enterprise_linux redhat:enterprise_linux	6.0; 7.0; 8.0	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
1–10 of 12

References

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.html	mailing-list, x-refsource-mlist, third-party-advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1954225	x-refsource-misc, issue-tracking, third-party-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BZOMV5J4PMZAORVT64BKLV6YIZAFDGX6/	vendor-advisory, x-refsource-fedora
https://security.gentoo.org/glsa/202107-05	vendor-advisory, x-refsource-gentoo, third-party-advisory
https://www.oracle.com/security-alerts/cpujan2022.html	x-refsource-misc, patch, third-party-advisory
https://gitlab.gnome.org/GNOME/libxml2/-/issues/230	x-refsource-misc, exploit, issue-tracking, third-party-advisory
https://gitlab.gnome.org/GNOME/libxml2/-/commit/1358d157d0bd83be1dfe356a69213df9fac0b539	x-refsource-misc, patch, third-party-advisory
https://security.netapp.com/advisory/ntap-20210716-0005/	x-refsource-confirm, third-party-advisory
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.