CVE-2021-3516

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2021-3516
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-06-01 14:15:10 UTC
Updated2026-10-14 10:17:42 UTC
DescriptionThere'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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Problem Types: CWE-416 | CWE-416 CWE-416

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
2.0[email protected]Primary6.8AV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial

AV:N/AC:M/Au:N/C:P/I:P/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 9.0 All All All
Operating System Fedoraproject Fedora 33 All All All
Operating System Fedoraproject Fedora 34 All All All
Application Netapp Clustered Data Ontap - All All All
Application Netapp Clustered Data Ontap Antivirus Connector - All All All
Application Netapp Ontap Select Deploy Administration Utility - All All All
Application Oracle Zfs Storage Appliance Kit 8.8 All All All
Operating System Redhat Enterprise Linux 6.0 All All All
Operating System Redhat Enterprise Linux 7.0 All All All
Operating System Redhat Enterprise Linux 8.0 All All All
Application Redhat Jboss Core Services - All All All
Application Xmlsoft Xmllint All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na Libxml2 affected libxml2 2.9.11 Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified

References

ReferenceSourceLinkTags
cert-portal.siemens.com/productcert/html/ssa-398330.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
[SECURITY] Fedora 33 Update: libxml2-2.9.12-4.fc33 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
Fix use-after-free with `xmllint --html --push` (1358d157) · Commits · GNOME / libxml2 · GitLab af854a3a-2127-422b-91ae-364da2661108 gitlab.gnome.org Patch, Third Party Advisory
heap-use-after-free in entities.c:621 (#230) · Issues · GNOME / libxml2 · GitLab af854a3a-2127-422b-91ae-364da2661108 gitlab.gnome.org Exploit, Issue Tracking, Third Party Advisory
[SECURITY] [DLA 2653-1] libxml2 security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
libxml2: Multiple vulnerabilities (GLSA 202107-05) — Gentoo security af854a3a-2127-422b-91ae-364da2661108 security.gentoo.org Third Party Advisory
CVE-2021-3516 Libxml2 Vulnerability in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
1954225 – (CVE-2021-3516) CVE-2021-3516 libxml2: use-after-free in xmlEncodeEntitiesInternal() in entities.c af854a3a-2127-422b-91ae-364da2661108 bugzilla.redhat.com Issue Tracking, Third Party Advisory
Oracle Critical Patch Update Advisory - January 2022 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Patch, Third Party Advisory
[SECURITY] Fedora 34 Update: libxml2-2.9.10-12.fc34 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
[SECURITY] Fedora 33 Update: libxml2-2.9.12-4.fc33 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
[SECURITY] Fedora 34 Update: libxml2-2.9.10-12.fc34 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 159285 Oracle Enterprise Linux Security Update for libxml2 (ELSA-2021-2569)
  • 174990 SUSE Enterprise Linux Security Update for libxml2 (SUSE-SU-2021:1523-1)
  • 174991 SUSE Enterprise Linux Security Update for libxml2 (SUSE-SU-2021:1524-1)
  • 178586 Debian Security Update for libxml2 (DLA 2653-1)
  • 180347 Debian Security Update for libxml2 (CVE-2021-3516)
  • 198409 Ubuntu Security Notification for libxml2 vulnerabilities (USN-4991-1)
  • 239468 Red Hat Update for libxml2 (RHSA-2021:2569)
  • 240235 Red Hat Update for JBoss Core Services (RHSA-2022:1389)
  • 281180 Fedora Security Update for libxml2 (FEDORA-2021-e3ed1ba38b)
  • 281707 Fedora Security Update for libxml2 (FEDORA-2021-b950000d2b)
  • 296065 Oracle Solaris 11.4 Support Repository Update (SRU) 39.107.1 Missing (CPUOCT2021)
  • 352459 Amazon Linux Security Advisory for libxml2: ALAS2-2021-1677
  • 354638 Amazon Linux Security Advisory for libxml2 : AL2012-2022-370
  • 354929 Amazon Linux Security Advisory for libxml2 : ALAS-2023-1743
  • 376952 NetApp Clustered Data Open Network Technology for Appliance Products (ONTAP) Disclosure of Sensitive Information Vulnerability (NTAP-20210625-0002,NTAP-20210716-0005)
  • 377408 Alibaba Cloud Linux Security Update for libxml2 (ALINUX3-SA-2021:0047)
  • 591406 Siemens SIMATIC S7-1500 CPU GNU/Linux subsystem Multiple Vulnerabilities (SSB-439005, ICSA-22-104-13)
  • 670491 EulerOS Security Update for libxml2 (EulerOS-SA-2021-2249)
  • 670517 EulerOS Security Update for libxml2 (EulerOS-SA-2021-2275)
  • 670548 EulerOS Security Update for libxml2 (EulerOS-SA-2021-2306)
  • 670648 EulerOS Security Update for libxml2 (EulerOS-SA-2021-2406)
  • 670750 EulerOS Security Update for libxml2 (EulerOS-SA-2021-2508)
  • 670851 EulerOS Security Update for libxml2 (EulerOS-SA-2021-2406)
  • 670996 EulerOS Security Update for libxml2 (EulerOS-SA-2021-2595)
  • 710071 Gentoo Linux libxml2 Multiple vulnerabilities (GLSA 202107-05)
  • 750025 SUSE Enterprise Linux Security Update for libxml2 (SUSE-SU-2021:1654-1)
  • 750027 SUSE Enterprise Linux Security Update for libxml2 (SUSE-SU-2021:1658-1)
  • 750201 OpenSUSE Security Update for libxml2 (openSUSE-SU-2021:0764-1)
  • 750222 OpenSUSE Security Update for libxml2 (openSUSE-SU-2021:0692-1)
  • 940375 AlmaLinux Security Update for libxml2 (ALSA-2021:2569)
  • 960016 Rocky Linux Security Update for libxml2 (RLSA-2021:2569)

© CVE.report 2026

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report