Vulnerability-Lookup

CVE-2020-11501 (GCVE-0-2020-11501)

Vulnerability from cvelistv5 – Published: 2020-04-03 12:42 – Updated: 2026-10-14 08:55

Summary

GnuTLS 3.6.x before 3.6.13 uses incorrect cryptography for DTLS. The earliest affected version is 3.6.3 (2018-07-16) because of an error in a 2017-10-06 commit. The DTLS client always uses 32 '\0' bytes instead of a random value, and thus contributes no randomness to a DTLS negotiation. This breaks the security guarantees of the DTLS protocol.

Severity

7.4 (High)


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

CWE

Assigner

mitre CNA under the mitre root

CNA scorecard E 28/100 over 2319 records in the last 180 days details

References

11 references

URL	Tags
https://security.gentoo.org/glsa/202004-06	vendor-advisoryx_refsource_GENTOO
https://gitlab.com/gnutls/gnutls/-/issues/960	x_refsource_MISC
https://gitlab.com/gnutls/gnutls/-/commit/5b595e8…	x_refsource_MISC
https://www.gnutls.org/security-new.html#GNUTLS-S…	x_refsource_MISC
https://www.debian.org/security/2020/dsa-4652	vendor-advisoryx_refsource_DEBIAN
http://lists.opensuse.org/opensuse-security-annou…	vendor-advisoryx_refsource_SUSE
https://security.netapp.com/advisory/ntap-2020041…	x_refsource_CONFIRM
https://usn.ubuntu.com/4322-1/	vendor-advisoryx_refsource_UBUNTU
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://cert-portal.siemens.com/productcert/html/…

Impacted products

3 products

Vendor	Product	Version	CPE status
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.0 , < V3.1.5 (custom)	guessed
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	Affected: V3.1.0 , < V3.1.5 (custom)	guessed
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.0 , < V3.1.5 (custom)	guessed

Show details on NVD website

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              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2020-04-03T13:15:13.170",
        "references": [
          {
            "source": "cve@mitre.org",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00015.html"
          },
          {
            "source": "cve@mitre.org",
            "tags": [
              "Patch",
              "Third Party Advisory"
            ],
            "url": "https://gitlab.com/gnutls/gnutls/-/commit/5b595e8e52653f6c5726a4cdd8fddeb6e83804d2"
          },
          {
            "source": "cve@mitre.org",
            "tags": [
              "Issue Tracking",
              "Patch",
              "Third Party Advisory"
            ],
            "url": "https://gitlab.com/gnutls/gnutls/-/issues/960"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ILMOWPKMTZAIMK5F32TUMO34XCABUCFJ/"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WDYY3R4F5CUTFAMXH2C5NKYFVDEJLTT7/"
          },
          {
            "source": "cve@mitre.org",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://security.gentoo.org/glsa/202004-06"
          },
          {
            "source": "cve@mitre.org",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20200416-0002/"
          },
          {
            "source": "cve@mitre.org",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://usn.ubuntu.com/4322-1/"
          },
          {
            "source": "cve@mitre.org",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://www.debian.org/security/2020/dsa-4652"
          },
          {
            "source": "cve@mitre.org",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-03-31"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00015.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Patch",
              "Third Party Advisory"
            ],
            "url": "https://gitlab.com/gnutls/gnutls/-/commit/5b595e8e52653f6c5726a4cdd8fddeb6e83804d2"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Issue Tracking",
              "Patch",
              "Third Party Advisory"
            ],
            "url": "https://gitlab.com/gnutls/gnutls/-/issues/960"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ILMOWPKMTZAIMK5F32TUMO34XCABUCFJ/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WDYY3R4F5CUTFAMXH2C5NKYFVDEJLTT7/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://security.gentoo.org/glsa/202004-06"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20200416-0002/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://usn.ubuntu.com/4322-1/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://www.debian.org/security/2020/dsa-4652"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-03-31"
          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-398330.html"
          }
        ],
        "sourceIdentifier": "cve@mitre.org",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-330"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-14T12:43:33+00:00",
      "cve": "CVE-2020-11501",
      "id": "CVE-2020-11501",
      "initial_release_date": "2020-03-27T00:00:00+00:00",
      "product_status:fixed": "75",
      "product_status:known_not_affected": "12",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "gnutls: DTLS client hello contains a random value of all zeroes",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-11501.json",
      "version": "3"
    }
  }
}

SSA-398330

Vulnerability from csaf_siemens - Published: 2023-12-12 00:00 - Updated: 2026-10-13 00:00

Summary

SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5

Scope

544 vulnerabilities in this advisory, including CVE-2020-11501.

CVE-2020-11501

7.4 (High)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:P/RL:O/RC:C

Known affected: 5 products

https://support.industry.siemens.com/cs/ww/en/view/109478459/

Open the full advisory

SUSE-SU-2020:0948-1

Vulnerability from csaf_suse - Published: 2020-04-08 05:44 - Updated: 2026-09-20 13:27

Summary

Security update for gmp, gnutls, libnettle

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2020-11501.

CVE-2020-11501

7.4 (High)


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

Recommended: 737 products

Open the full advisory

SUSE-SU-2020:0948-2

Vulnerability from csaf_suse - Published: 2022-07-13 16:17 - Updated: 2026-09-20 13:27

Summary

Security update for gmp, gnutls, libnettle

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2020-11501.

CVE-2020-11501

7.4 (High)


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

Recommended: 34 products

Open the full advisory

UBUNTU-CVE-2020-11501 (CVE-2020-11501)

Vulnerability from osv_ubuntu – Published: 2020-04-03 13:15 – Updated: 2025-07-16 04:55 – Source website

Withdrawn 2025-07-18

Details

Severity

7.4 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2020-11501	REPORT
	https://www.gnutls.org/security-new.html#GNUTLS-S…	REPORT
	https://gitlab.com/gnutls/gnutls/-/commit/5b595e8…	REPORT
	https://ubuntu.com/security/notices/USN-4322-1	ADVISORY
	https://www.cve.org/CVERecord?id=CVE-2020-11501	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "gnutls-bin",
            "binary_version": "3.4.10-4ubuntu1.7"
          },
          {
            "binary_name": "gnutls-bin-dbgsym",
            "binary_version": "3.4.10-4ubuntu1.7"
          },
          {
            "binary_name": "gnutls-doc",
            "binary_version": "3.4.10-4ubuntu1.7"
          },
          {
            "binary_name": "guile-gnutls",
            "binary_version": "3.4.10-4ubuntu1.7"
          },
          {
            "binary_name": "guile-gnutls-dbgsym",
            "binary_version": "3.4.10-4ubuntu1.7"
          },
          {
            "binary_name": "libgnutls-dev",
            "binary_version": "3.4.10-4ubuntu1.7"
          },
          {
            "binary_name": "libgnutls-openssl27",
            "binary_version": "3.4.10-4ubuntu1.7"
          },
          {
            "binary_name": "libgnutls-openssl27-dbgsym",
            "binary_version": "3.4.10-4ubuntu1.7"
          },
          {
            "binary_name": "libgnutls28-dev",
            "binary_version": "3.4.10-4ubuntu1.7"
          },
          {
            "binary_name": "libgnutls30",
            "binary_version": "3.4.10-4ubuntu1.7"
          },
          {
            "binary_name": "libgnutls30-dbgsym",
            "binary_version": "3.4.10-4ubuntu1.7"
          },
          {
            "binary_name": "libgnutlsxx28",
            "binary_version": "3.4.10-4ubuntu1.7"
          },
          {
            "binary_name": "libgnutlsxx28-dbgsym",
            "binary_version": "3.4.10-4ubuntu1.7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "gnutls28",
        "purl": "pkg:deb/ubuntu/gnutls28@3.4.10-4ubuntu1.7?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.4.10-4ubuntu1.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.3.15-5ubuntu2",
        "3.3.18-1ubuntu1",
        "3.3.20-1ubuntu1",
        "3.4.9-2ubuntu1",
        "3.4.10-4ubuntu1",
        "3.4.10-4ubuntu1.1",
        "3.4.10-4ubuntu1.2",
        "3.4.10-4ubuntu1.3",
        "3.4.10-4ubuntu1.4",
        "3.4.10-4ubuntu1.5",
        "3.4.10-4ubuntu1.6"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "gnutls-bin",
            "binary_version": "3.5.18-1ubuntu1.3"
          },
          {
            "binary_name": "gnutls-bin-dbgsym",
            "binary_version": "3.5.18-1ubuntu1.3"
          },
          {
            "binary_name": "gnutls-doc",
            "binary_version": "3.5.18-1ubuntu1.3"
          },
          {
            "binary_name": "libgnutls-dane0",
            "binary_version": "3.5.18-1ubuntu1.3"
          },
          {
            "binary_name": "libgnutls-dane0-dbgsym",
            "binary_version": "3.5.18-1ubuntu1.3"
          },
          {
            "binary_name": "libgnutls-openssl27",
            "binary_version": "3.5.18-1ubuntu1.3"
          },
          {
            "binary_name": "libgnutls-openssl27-dbgsym",
            "binary_version": "3.5.18-1ubuntu1.3"
          },
          {
            "binary_name": "libgnutls28-dev",
            "binary_version": "3.5.18-1ubuntu1.3"
          },
          {
            "binary_name": "libgnutls30",
            "binary_version": "3.5.18-1ubuntu1.3"
          },
          {
            "binary_name": "libgnutls30-dbgsym",
            "binary_version": "3.5.18-1ubuntu1.3"
          },
          {
            "binary_name": "libgnutlsxx28",
            "binary_version": "3.5.18-1ubuntu1.3"
          },
          {
            "binary_name": "libgnutlsxx28-dbgsym",
            "binary_version": "3.5.18-1ubuntu1.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "gnutls28",
        "purl": "pkg:deb/ubuntu/gnutls28@3.5.18-1ubuntu1.3?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.5.18-1ubuntu1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.5.8-6ubuntu3",
        "3.5.17-1ubuntu1",
        "3.5.17-1ubuntu3",
        "3.5.18-1ubuntu1",
        "3.5.18-1ubuntu1.1",
        "3.5.18-1ubuntu1.2"
      ]
    }
  ],
  "aliases": [],
  "details": "GnuTLS 3.6.x before 3.6.13 uses incorrect cryptography for DTLS. The earliest affected version is 3.6.3 (2018-07-16) because of an error in a 2017-10-06 commit. The DTLS client always uses 32 \u0027\\0\u0027 bytes instead of a random value, and thus contributes no randomness to a DTLS negotiation. This breaks the security guarantees of the DTLS protocol.",
  "id": "UBUNTU-CVE-2020-11501",
  "modified": "2025-07-16T04:55:43Z",
  "published": "2020-04-03T13:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-11501"
    },
    {
      "type": "REPORT",
      "url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-03-31"
    },
    {
      "type": "REPORT",
      "url": "https://gitlab.com/gnutls/gnutls/-/commit/5b595e8e52653f6c5726a4cdd8fddeb6e83804d2"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4322-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-11501"
    }
  ],
  "related": [
    "USN-4322-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2020-11501"
  ],
  "withdrawn": "2025-07-18T16:45:48Z"
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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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.

Action not permitted

CVE-2020-11501 (GCVE-0-2020-11501)

SSA-398330

SUSE-SU-2020:0948-1

SUSE-SU-2020:0948-2

UBUNTU-CVE-2020-11501 (CVE-2020-11501)

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Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour