ubuntu-cve-2020-12823
Vulnerability from osv_ubuntu
Published
2020-05-12 18:15
Modified
2026-04-22 07:39
Summary
Details

OpenConnect 8.09 has a buffer overflow, causing a denial of service (application crash) or possibly unspecified other impact, via crafted certificate data to get_cert_name in gnutls.c.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libopenconnect5",
            "binary_version": "7.06-2build2"
          },
          {
            "binary_name": "openconnect",
            "binary_version": "7.06-2build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "openconnect",
        "purl": "pkg:deb/ubuntu/openconnect@7.06-2build2?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.06-2build1",
        "7.06-2build2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libopenconnect5",
            "binary_version": "7.08-3ubuntu0.18.04.2"
          },
          {
            "binary_name": "openconnect",
            "binary_version": "7.08-3ubuntu0.18.04.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "openconnect",
        "purl": "pkg:deb/ubuntu/openconnect@7.08-3ubuntu0.18.04.2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.08-1",
        "7.08-2",
        "7.08-3",
        "7.08-3ubuntu0.18.04.1",
        "7.08-3ubuntu0.18.04.2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libopenconnect5",
            "binary_version": "8.05-1"
          },
          {
            "binary_name": "openconnect",
            "binary_version": "8.05-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "openconnect",
        "purl": "pkg:deb/ubuntu/openconnect@8.05-1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "8.02-1build1",
        "8.05-1"
      ]
    }
  ],
  "aliases": [],
  "details": "OpenConnect 8.09 has a buffer overflow, causing a denial of service (application crash) or possibly unspecified other impact, via crafted certificate data to get_cert_name in gnutls.c.",
  "id": "UBUNTU-CVE-2020-12823",
  "modified": "2026-04-22T07:39:24Z",
  "published": "2020-05-12T18:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-12823"
    },
    {
      "type": "REPORT",
      "url": "https://gitlab.com/openconnect/openconnect/-/merge_requests/108"
    },
    {
      "type": "REPORT",
      "url": "https://bugs.gentoo.org/721570"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-12823"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2020-12823"
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.