Vulnerability-Lookup

OESA-2022-1889 (CVE-2021-4209)

Vulnerability from osv_openeuler – Published: 2022-09-02 11:05 – Updated: 2026-08-06 11:05 – Source website

Summary

gnutls security update

Details

GnuTLS is a secure communications library implementing the SSL, TLS and DTLS protocols and technologies around them. It provides a simple C language application programming interface (API) to access the secure communications protocols as well as APIs to parse and write X.509, PKCS #12, and other required structures.The project strives to provide a secure communications back-end, simple to use and integrated with the rest of the base Linux libraries. A back-end designed to work and be secure out of the box, keeping the complexity of TLS and PKI out of application code.

Security Fix(es):

A 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.(CVE-2021-4209)

Severity

6.5 (Medium)


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

References

URL

Type

	https://www.openeuler.org/en/security/safety-bull…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-4209	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "gnutls-debuginfo-3.6.14-9.oe1.aarch64.rpm",
          "gnutls-debugsource-3.6.14-9.oe1.aarch64.rpm",
          "gnutls-devel-3.6.14-9.oe1.aarch64.rpm",
          "gnutls-3.6.14-9.oe1.aarch64.rpm"
        ],
        "noarch": [
          "gnutls-help-3.6.14-9.oe1.noarch.rpm"
        ],
        "src": [
          "gnutls-3.6.14-9.oe1.src.rpm"
        ],
        "x86_64": [
          "gnutls-debuginfo-3.6.14-9.oe1.x86_64.rpm",
          "gnutls-3.6.14-9.oe1.x86_64.rpm",
          "gnutls-devel-3.6.14-9.oe1.x86_64.rpm",
          "gnutls-debugsource-3.6.14-9.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP1",
        "name": "gnutls",
        "purl": "pkg:rpm/openEuler/gnutls\u0026distro=openEuler-20.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.6.14-9.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
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        ],
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        ],
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        ],
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        "purl": "pkg:rpm/openEuler/gnutls\u0026distro=openEuler-20.03-LTS-SP3"
      },
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        {
          "events": [
            {
              "introduced": "0"
            },
            {
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
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          "gnutls-utils-3.7.2-4.oe2203.aarch64.rpm",
          "gnutls-debuginfo-3.7.2-4.oe2203.aarch64.rpm",
          "gnutls-devel-3.7.2-4.oe2203.aarch64.rpm",
          "gnutls-3.7.2-4.oe2203.aarch64.rpm"
        ],
        "noarch": [
          "gnutls-help-3.7.2-4.oe2203.noarch.rpm"
        ],
        "src": [
          "gnutls-3.7.2-4.oe2203.src.rpm"
        ],
        "x86_64": [
          "gnutls-debuginfo-3.7.2-4.oe2203.x86_64.rpm",
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          "gnutls-debugsource-3.7.2-4.oe2203.x86_64.rpm",
          "gnutls-devel-3.7.2-4.oe2203.x86_64.rpm",
          "gnutls-utils-3.7.2-4.oe2203.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS",
        "name": "gnutls",
        "purl": "pkg:rpm/openEuler/gnutls\u0026distro=openEuler-22.03-LTS"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.7.2-4.oe2203"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "GnuTLS is a secure communications library implementing the SSL, TLS and DTLS protocols and technologies around them. It provides a simple C language application programming interface (API) to access the secure communications protocols as well as APIs to parse and write X.509, PKCS #12, and other required structures.The project strives to provide a secure communications back-end, simple to use and integrated with the rest of the base Linux libraries. A back-end designed to work and be secure out of the box, keeping the complexity of TLS and PKI out of application code.\r\n\r\nSecurity Fix(es):\r\n\r\nA NULL pointer dereference flaw was found in GnuTLS. As Nettle\u0026apos;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.(CVE-2021-4209)",
  "id": "OESA-2022-1889",
  "modified": "2026-08-06T11:05:09Z",
  "published": "2022-09-02T11:05:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2022-1889"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-4209"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "gnutls security update",
  "upstream": [
    "CVE-2021-4209"
  ]
}

CVE-2021-4209 (GCVE-0-2021-4209)

Vulnerability from cvelistv5 – Published: 2022-08-24 15:07 – Updated: 2024-08-03 17:16

Summary

Severity

No CVSS data available.

CWE

CWE-476 - - NULL Pointer Dereference

Assigner

redhat redhat root

References

6 references

URL	Tags
https://gitlab.com/gnutls/gnutls/-/issues/1306	x_refsource_MISC
https://bugzilla.redhat.com/show_bug.cgi?id=2044156	x_refsource_MISC
https://access.redhat.com/security/cve/CVE-2021-4209	x_refsource_MISC
https://gitlab.com/gnutls/gnutls/-/merge_requests/1503	x_refsource_MISC
https://gitlab.com/gnutls/gnutls/-/commit/3db3527…	x_refsource_MISC
https://security.netapp.com/advisory/ntap-2022091…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
n/a	GnuTLS	Affected: Fixed in gnutls v3.7.3

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.