CVE-2021-4209

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Summary

CVECVE-2021-4209
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2022-08-24 16:15:09 UTC
Updated2026-10-14 11:16:55 UTC
DescriptionA NULL pointer dereference flaw was found in GnuTLS. As Nettle's hash update functions internally call memcpy, providing zero-length input may cause undefined behavior. This flaw leads to a denial of service after authentication in rare circumstances.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

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

Problem Types: CWE-476 | CWE-476 CWE-476 - NULL Pointer Dereference

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Gnu Gnutls All All All All
Application Netapp Active Iq Unified Manager - All All All
Application Netapp Hci Bootstrap Os - All All All
Hardware Netapp Hci Compute Node - All All All
Application Netapp Solidfire Hci Management Node - All All All
Operating System Redhat Enterprise Linux 8.0 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na GnuTLS affected Fixed in gnutls v3.7.3 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
2044156 – (CVE-2021-4209) CVE-2021-4209 GnuTLS: Null pointer dereference in MD_UPDATE af854a3a-2127-422b-91ae-364da2661108 bugzilla.redhat.com Issue Tracking, Third Party Advisory
Null pointer dereference in MD_UPDATE (#1306) · Issues · gnutls / GnuTLS · GitLab af854a3a-2127-422b-91ae-364da2661108 gitlab.com Third Party Advisory
wrap_nettle_hash_fast: avoid calling _update with zero-length input (!1503) · Merge requests · gnutls / GnuTLS · GitLab af854a3a-2127-422b-91ae-364da2661108 gitlab.com Third Party Advisory
wrap_nettle_hash_fast: avoid calling _update with zero-length input (3db35273) · Commits · gnutls / GnuTLS · GitLab af854a3a-2127-422b-91ae-364da2661108 gitlab.com Patch, Third Party Advisory
Red Hat Customer Portal - Access to 24x7 support and knowledge af854a3a-2127-422b-91ae-364da2661108 access.redhat.com Third Party Advisory
CVE-2021-4209 GnuTLS Vulnerability in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 180842 Debian Security Update for gnutls28 (CVE-2021-4209)
  • 180936 Debian Security Update for gnutls28 (DLA 3070-1)
  • 198887 Ubuntu Security Notification for GnuTLS Vulnerabilities (USN-5550-1)
  • 591406 Siemens SIMATIC S7-1500 CPU GNU/Linux subsystem Multiple Vulnerabilities (SSB-439005, ICSA-22-104-13)
  • 672285 EulerOS Security Update for gnutls (EulerOS-SA-2022-2650)
  • 672289 EulerOS Security Update for gnutls (EulerOS-SA-2022-2682)
  • 672333 EulerOS Security Update for gnutls (EulerOS-SA-2022-2730)
  • 672364 EulerOS Security Update for gnutls (EulerOS-SA-2022-2765)
  • 672584 EulerOS Security Update for gnutls (EulerOS-SA-2023-1316)
  • 672721 EulerOS Security Update for gnutls (EulerOS-SA-2023-1504)
  • 751774 SUSE Enterprise Linux Security Update for gnutls (SUSE-SU-2022:0678-1)
  • 751775 SUSE Enterprise Linux Security Update for gnutls (SUSE-SU-2022:0677-1)
  • 751813 OpenSUSE Security Update for gnutls (openSUSE-SU-2022:0717-1)
  • 752000 SUSE Enterprise Linux Security Update for gnutls (SUSE-SU-2022:0717-1)
  • 752481 SUSE Enterprise Linux Security Update for gnutls (SUSE-SU-2022:2830-1)
  • 903766 Common Base Linux Mariner (CBL-Mariner) Security Update for gnutls (10700)
  • 904180 Common Base Linux Mariner (CBL-Mariner) Security Update for gnutls (10700-1)

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