CVE-2021-3516There's a flaw in libxml2's xmllint in versions before 2.9.11.
Updated under an hour ago ()
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.
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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
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 |
netapp ontap_select_deploy_administration_utility netapp:ontap_select_deploy_administration_utility | all versions | 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=1954225x-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/202107-05vendor-advisory, x-refsource-gentoo, third-party-advisory
- https://www.oracle.com/security-alerts/cpujan2022.htmlx-refsource-misc, patch, third-party-advisory
- https://gitlab.gnome.org/GNOME/libxml2/-/issues/230x-refsource-misc, exploit, issue-tracking, third-party-advisory
- https://gitlab.gnome.org/GNOME/libxml2/-/commit/1358d157d0bd83be1dfe356a69213df9fac0b539x-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.