USN-4547-2 (UBUNTU-CVE-2018-20020)

Vulnerability from osv_ubuntu – Published: 2020-09-28 19:52 – Updated: 2026-04-27 14:11 – Source website
VLAI
Summary
ssvnc vulnerabilities
Details

It was discovered that the LibVNCClient vendored in SSVNC incorrectly handled certain packet lengths. A remote attacker could possibly use this issue to obtain sensitive information, cause a denial of service, or execute arbitrary code. (CVE-2018-20020, CVE-2018-20021, CVE-2018-20022, CVE-2018-2024)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2018-20020",
              "severity": [
                {
                  "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2018-20021",
              "severity": [
                {
                  "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2018-20022",
              "severity": [
                {
                  "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2018-20024",
              "severity": [
                {
                  "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "ssvnc",
            "binary_version": "1.0.29-2+deb8u1build0.16.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "ssvnc",
        "purl": "pkg:deb/ubuntu/ssvnc@1.0.29-2+deb8u1build0.16.04.1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.0.29-2+deb8u1build0.16.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0.29-2build1"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that the LibVNCClient vendored in SSVNC incorrectly handled\ncertain packet lengths. A remote attacker could possibly use this issue to\nobtain sensitive information, cause a denial of service, or execute arbitrary\ncode. (CVE-2018-20020, CVE-2018-20021, CVE-2018-20022, CVE-2018-2024)\n",
  "id": "USN-4547-2",
  "modified": "2026-04-27T14:11:25Z",
  "published": "2020-09-28T19:52:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4547-2"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-20020"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-20021"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-20022"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-20024"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "ssvnc vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2018-20020",
    "UBUNTU-CVE-2018-20021",
    "UBUNTU-CVE-2018-20022",
    "UBUNTU-CVE-2018-20024"
  ]
}



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