critical
9.8
CWE
416
Advisory Published
CVE Published
Updated

CVE-2021-20231: Use After Free

First published: Fri Jan 29 2021(Updated: )

GnuTLS is vulnerable to a denial of service, caused by a use-after-free issue in client sending key_share extension. By sending a specially-crafted request, an attacker could exploit this vulnerability to cause memory corruption and other consequences.

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
IBM QRadar SIEM<=7.5.0 GA
IBM QRadar SIEM<=7.4.3 GA - 7.4.3 FP4
IBM QRadar SIEM<=7.3.3 GA - 7.3.3 FP10
redhat/gnutls<3.7.1
3.7.1
GNU GnuTLS>=3.6.3<3.7.1
Redhat Enterprise Linux=8.0
Fedoraproject Fedora=34
Netapp Active Iq Unified Manager Vmware Vsphere
Netapp E-series Performance Analyzer

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=1922276

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2021-20231?

    CVE-2021-20231 is a vulnerability in GnuTLS that allows for a denial of service attack by exploiting a use-after-free issue in client sending key_share extension.

  • What can an attacker do with CVE-2021-20231?

    By exploiting CVE-2021-20231, an attacker can cause memory corruption and other consequences, leading to a denial of service.

  • Which software is affected by CVE-2021-20231?

    IBM QRadar SIEM versions 7.5.0 GA, 7.4.3 GA - 7.4.3 FP4, and 7.3.3 GA - 7.3.3 FP10 are affected by CVE-2021-20231.

  • How severe is CVE-2021-20231?

    CVE-2021-20231 has a severity rating of 7.4, which is considered high.

  • How can I fix CVE-2021-20231?

    To fix CVE-2021-20231, you should apply the relevant patches provided by IBM for the affected versions of QRadar SIEM.

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