CVE-2021-3537
MEDIUMCVSS 5.9/10EPSS 3.50%
Last modified
CVE-2021-3537 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. 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. EPSS estimates a 3.50% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Xmlsoft | Libxml2 | < 2.9.11 | — |
| Redhat | Jboss Core Services | All versions | — |
| Redhat | Enterprise Linux | 6.0 | — |
| Redhat | Enterprise Linux | 7.0 | — |
| Redhat | Enterprise Linux | 8.0 | — |
| Debian | Debian Linux | 9.0 | — |
| 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 | Openjdk | 8 | Update301 |
| 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
- https://bugzilla.redhat.com/show_bug.cgi?id=1956522Issue Tracking, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/05/msg00008.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202107-05Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210625-0002/Third 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
- https://bugzilla.redhat.com/show_bug.cgi?id=1956522Issue Tracking, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/05/msg00008.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202107-05Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210625-0002/Third 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
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-3537?
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.
How severe is CVE-2021-3537?
CVE-2021-3537 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 3.50% probability of exploitation in the next 30 days.
How do I fix CVE-2021-3537?
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.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-3537?
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