CVE-2021-3518

Name: CVE-2021-3518
Creator: NVD / NIST
Published: 2021-05-18T12:15:08.043+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 3.65%

Last modified Jun 17, 2026

CVE-2021-3518 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 3.65% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

3.65%

88.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Xmlsoft	Libxml2	< 2.9.11
Debian	Debian Linux	9.0
Redhat	Jboss Core Services	All versions
Redhat	Enterprise Linux	8.0
Fedoraproject	Fedora	33
Fedoraproject	Fedora	34
Netapp	Active Iq Unified Manager	All versions
Netapp	Clustered Data Ontap	All versions
Netapp	Clustered Data Ontap Antivirus Connector	All versions
Netapp	Manageability Software Development Kit	All versions
Netapp	Ontap Select Deploy Administration Utility	All versions
Netapp	Snapdrive	All versions
Netapp	Hci H410c Firmware	All versions
Oracle	Communications Cloud Native Core Network Function Cloud Native Environment	1.10.0
Oracle	Enterprise Manager Base Platform	13.4.0.0
Oracle	Enterprise Manager Base Platform	13.5.0.0
Oracle	Enterprise Manager Ops Center	12.4.0.0
Oracle	Mysql Workbench	<= 8.0.26
Oracle	Peoplesoft Enterprise Peopletools	8.58
Oracle	Real User Experience Insight	13.4.1.0
Oracle	Real User Experience Insight	13.5.1.0

References

http://seclists.org/fulldisclosure/2021/Jul/54Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/Jul/55Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/Jul/58Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/Jul/59Mailing List, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1954242Issue Tracking, Patch, Third Party Advisory
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
https://lists.debian.org/debian-lts-announce/2021/05/msg00008.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BZOMV5J4PMZAORVT64BKLV6YIZAFDGX6/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QVM4UJ3376I6ZVOYMHBNX4GY3NIV52WV/
https://security.gentoo.org/glsa/202107-05Third Party Advisory
https://security.netapp.com/advisory/ntap-20210625-0002/Third Party Advisory
https://support.apple.com/kb/HT212601Third Party Advisory
https://support.apple.com/kb/HT212602Third Party Advisory
https://support.apple.com/kb/HT212604Third Party Advisory
https://support.apple.com/kb/HT212605Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.htmlNot Applicable
https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
http://seclists.org/fulldisclosure/2021/Jul/54Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/Jul/55Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/Jul/58Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2021/Jul/59Mailing List, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1954242Issue Tracking, Patch, Third Party Advisory
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
https://lists.debian.org/debian-lts-announce/2021/05/msg00008.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BZOMV5J4PMZAORVT64BKLV6YIZAFDGX6/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QVM4UJ3376I6ZVOYMHBNX4GY3NIV52WV/
https://security.gentoo.org/glsa/202107-05Third Party Advisory
https://security.netapp.com/advisory/ntap-20210625-0002/Third Party Advisory
https://support.apple.com/kb/HT212601Third Party Advisory
https://support.apple.com/kb/HT212602Third Party Advisory
https://support.apple.com/kb/HT212604Third Party Advisory
https://support.apple.com/kb/HT212605Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.htmlNot Applicable
https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory

Timeline

Published: May 18, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3518?

How severe is CVE-2021-3518?

CVE-2021-3518 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 3.65% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3518?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3518?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST