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CVE-2021-3537

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Date: May 14, 2021

A vulnerability found in libxml2 in versions before 2.9.11 shows that it did not propagate errors while parsing XML mixed content, causing a NULL dereference. If an untrusted XML document was parsed in recovery mode and post-validated, the flaw could be used to crash the application. The highest threat from this vulnerability is to system availability.

Language: C

Severity Score

Related Resources (19)

https://github.com/sparklemotion/nokogiri/blob/2edbbef95f1dc12c1ddc5ebda71b9159026245fe/CHANGELOG.md?plain=1#L722
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://access.redhat.com/security/cve/CVE-2021-3537
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/nokogiri/CVE-2021-3537.yml
https://nokogiri.org/CHANGELOG.html#1114-2021-05-14
https://security.netapp.com/advisory/ntap-20210625-0002
https://bugzilla.redhat.com/show_bug.cgi?id=1956522
https://security.netapp.com/advisory/ntap-20210625-0002/
https://nvd.nist.gov/vuln/detail/CVE-2021-3537
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BZOMV5J4PMZAORVT64BKLV6YIZAFDGX6
https://security.gentoo.org/glsa/202107-05
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QVM4UJ3376I6ZVOYMHBNX4GY3NIV52WV
https://github.com/sparklemotion/nokogiri
https://www.oracle.com/security-alerts/cpuapr2022.html
https://lists.debian.org/debian-lts-announce/2021/05/msg00008.html
https://www.oracle.com/security-alerts/cpujul2022.html
https://www.oracle.com/security-alerts/cpuoct2021.html
https://www.mend.io/vulnerability-database/CVE-2021-3537

Severity Score

Weakness Type (CWE)

NULL Pointer Dereference

CWE-476

Top Fix

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Upgrade Version

Upgrade to version libxml2 2.9.11

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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