CVE-2021-20231

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2021-20231
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-03-12 19:15:13 UTC
Updated2026-10-14 11:16:51 UTC
DescriptionA flaw was found in gnutls. A use after free issue in client sending key_share extension may lead to memory corruption and other consequences.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

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

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
2.0[email protected]Primary7.5AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS v3.1 Breakdown

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

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

CVSS v2.0 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Fedoraproject Fedora 34 All All All
Application Gnu Gnutls All All All All
Application Netapp Active Iq Unified Manager - All All All
Application Netapp E-series Performance Analyzer - All All All
Operating System Redhat Enterprise Linux 8.0 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na Gnutls affected gnutls 3.7.1 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
March 2021 GnuTLS Vulnerabilities in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
lists.apache.org/thread.html/rfd5273d72d244178441e6904a2f2b41a3268f569e8092ea0... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
lists.apache.org/thread.html/rf5e1256d870193def4a82ad89ab95e63943a313b5ff0d81a... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
lists.apache.org/thread.html/r5f88bed447742fcc5c47bf1c7be965ef450131914a6e1f85... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
1922276 – (CVE-2021-20231) CVE-2021-20231 gnutls: Use after free in client key_share extension af854a3a-2127-422b-91ae-364da2661108 bugzilla.redhat.com Issue Tracking, Patch, Third Party Advisory
lists.apache.org/thread.html/r5d4001031e7790d8c6396c499522b4ed2aab782da87b1a14... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
lists.apache.org/thread.html/r6ac143ba6dd98bd4bf6bf010d46e56e254056459721ba188... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
[SECURITY] Fedora 34 Update: gnutls-3.7.1-2.fc34 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
GnuTLS af854a3a-2127-422b-91ae-364da2661108 www.gnutls.org Exploit, Vendor Advisory
lists.apache.org/thread.html/rcd70a4c88a47a75fd2d5f3ffb7cee8c2a18c713320bd90fd... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
lists.apache.org/thread.html/r9cbc69e57276413788e90a6ee16c7c034ea4258d31935b70... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
lists.apache.org/thread.html/r50661d6f0082709aad9a584431b59ec364f9974b63b07e08... af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
[SECURITY] Fedora 34 Update: gnutls-3.7.1-2.fc34 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
Pony Mail! MITRE lists.apache.org
Pony Mail! MITRE lists.apache.org
Pony Mail! MITRE lists.apache.org
Pony Mail! MITRE lists.apache.org
Pony Mail! MITRE lists.apache.org
Pony Mail! MITRE lists.apache.org
Pony Mail! MITRE lists.apache.org
Pony Mail! MITRE lists.apache.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 159515 Oracle Enterprise Linux Security Update for gnutls and nettle (ELSA-2021-4451)
  • 159717 Oracle Enterprise Linux Security Update for gnutls (ELSA-2022-9221)
  • 174833 SUSE Enterprise Linux Security update for gnutls (SUSE-SU-2021:0934-1)
  • 174836 SUSE Enterprise Linux Security update for gnutls (SUSE-SU-2021:0935-1)
  • 174852 SUSE Enterprise Linux Security update for gnutls (SUSE-SU-2021:0934-1)
  • 174855 SUSE Enterprise Linux Security update for gnutls (SUSE-SU-2021:0935-1)
  • 180548 Debian Security Update for gnutls28 (CVE-2021-20231)
  • 198448 Ubuntu Security Notification for GnuTransport Layer Security vulnerabilities (USN-5029-1)
  • 239785 Red Hat Update for gnutls and nettle security (RHSA-2021:4451)
  • 281477 Fedora Security Update for gnutls (FEDORA-2021-18bef34f05)
  • 296059 Oracle Solaris 11.4 Support Repository Update (SRU) 36.0.1.101.2 Missing (CPUJUL2021)
  • 500235 Alpine Linux Security Update for gnutls
  • 501415 Alpine Linux Security Update for gnutls
  • 503982 Alpine Linux Security Update for gnutls
  • 591406 Siemens SIMATIC S7-1500 CPU GNU/Linux subsystem Multiple Vulnerabilities (SSB-439005, ICSA-22-104-13)
  • 670487 EulerOS Security Update for gnutls (EulerOS-SA-2021-2245)
  • 670513 EulerOS Security Update for gnutls (EulerOS-SA-2021-2271)
  • 671037 EulerOS Security Update for gnutls (EulerOS-SA-2021-2632)
  • 750298 OpenSUSE Security Update for gnutls (openSUSE-SU-2021:0470-1)
  • 900025 CBL-Mariner Linux Security Update for gnutls 3.6.14
  • 901655 Common Base Linux Mariner (CBL-Mariner) Security Update for gnutls (6446-1)
  • 903051 Common Base Linux Mariner (CBL-Mariner) Security Update for gnutls (3972)
  • 940170 AlmaLinux Security Update for gnutls and nettle (ALSA-2021:4451)

© 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