ubuntu-cve-2020-25697
Vulnerability from osv_ubuntu
Published
2021-05-26 13:15
Modified
2026-04-22 07:39
Summary
Details

A privilege escalation flaw was found in the Xorg-x11-server due to a lack of authentication for X11 clients. This flaw allows an attacker to take control of an X application by impersonating the server it is expecting to connect to.

Severity
7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
N/A (UNKNOWN)
low
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libx11-6",
            "binary_version": "2:1.6.2-1ubuntu2.1+esm5"
          },
          {
            "binary_name": "libx11-data",
            "binary_version": "2:1.6.2-1ubuntu2.1+esm5"
          },
          {
            "binary_name": "libx11-xcb1",
            "binary_version": "2:1.6.2-1ubuntu2.1+esm5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "libx11",
        "purl": "pkg:deb/ubuntu/libx11@2:1.6.2-1ubuntu2.1+esm5?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:1.6.1-1ubuntu1",
        "2:1.6.1-1ubuntu2",
        "2:1.6.2-1ubuntu1",
        "2:1.6.2-1ubuntu2",
        "2:1.6.2-1ubuntu2.1",
        "2:1.6.2-1ubuntu2.1+esm1",
        "2:1.6.2-1ubuntu2.1+esm2",
        "2:1.6.2-1ubuntu2.1+esm3",
        "2:1.6.2-1ubuntu2.1+esm4",
        "2:1.6.2-1ubuntu2.1+esm5"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libx11-6",
            "binary_version": "2:1.6.3-1ubuntu2.2+esm4"
          },
          {
            "binary_name": "libx11-data",
            "binary_version": "2:1.6.3-1ubuntu2.2+esm4"
          },
          {
            "binary_name": "libx11-xcb1",
            "binary_version": "2:1.6.3-1ubuntu2.2+esm4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "libx11",
        "purl": "pkg:deb/ubuntu/libx11@2:1.6.3-1ubuntu2.2+esm4?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:1.6.3-1ubuntu2",
        "2:1.6.3-1ubuntu2.1",
        "2:1.6.3-1ubuntu2.2",
        "2:1.6.3-1ubuntu2.2+esm1",
        "2:1.6.3-1ubuntu2.2+esm2",
        "2:1.6.3-1ubuntu2.2+esm3",
        "2:1.6.3-1ubuntu2.2+esm4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libx11-6",
            "binary_version": "2:1.6.4-3ubuntu0.4+esm2"
          },
          {
            "binary_name": "libx11-data",
            "binary_version": "2:1.6.4-3ubuntu0.4+esm2"
          },
          {
            "binary_name": "libx11-xcb1",
            "binary_version": "2:1.6.4-3ubuntu0.4+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "libx11",
        "purl": "pkg:deb/ubuntu/libx11@2:1.6.4-3ubuntu0.4+esm2?arch=source\u0026distro=esm-infra/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:1.6.4-3",
        "2:1.6.4-3ubuntu0.1",
        "2:1.6.4-3ubuntu0.2",
        "2:1.6.4-3ubuntu0.3",
        "2:1.6.4-3ubuntu0.4",
        "2:1.6.4-3ubuntu0.4+esm1",
        "2:1.6.4-3ubuntu0.4+esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libx11-6",
            "binary_version": "2:1.6.9-2ubuntu1.6"
          },
          {
            "binary_name": "libx11-data",
            "binary_version": "2:1.6.9-2ubuntu1.6"
          },
          {
            "binary_name": "libx11-xcb1",
            "binary_version": "2:1.6.9-2ubuntu1.6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "libx11",
        "purl": "pkg:deb/ubuntu/libx11@2:1.6.9-2ubuntu1.6?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:1.6.8-1",
        "2:1.6.9-2",
        "2:1.6.9-2ubuntu1",
        "2:1.6.9-2ubuntu1.1",
        "2:1.6.9-2ubuntu1.2",
        "2:1.6.9-2ubuntu1.5",
        "2:1.6.9-2ubuntu1.6"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libx11-6",
            "binary_version": "2:1.7.5-1ubuntu0.3"
          },
          {
            "binary_name": "libx11-data",
            "binary_version": "2:1.7.5-1ubuntu0.3"
          },
          {
            "binary_name": "libx11-xcb1",
            "binary_version": "2:1.7.5-1ubuntu0.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "libx11",
        "purl": "pkg:deb/ubuntu/libx11@2:1.7.5-1ubuntu0.3?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:1.7.2-1",
        "2:1.7.2-2",
        "2:1.7.2-2build1",
        "2:1.7.5-1",
        "2:1.7.5-1ubuntu0.2",
        "2:1.7.5-1ubuntu0.3"
      ]
    }
  ],
  "aliases": [],
  "details": "A privilege escalation flaw was found in the Xorg-x11-server due to a lack of authentication for X11 clients. This flaw allows an attacker to take control of an X application by impersonating the server it is expecting to connect to.",
  "id": "UBUNTU-CVE-2020-25697",
  "modified": "2026-04-22T07:39:33Z",
  "published": "2021-05-26T13:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-25697"
    },
    {
      "type": "REPORT",
      "url": "https://www.openwall.com/lists/oss-security/2020/11/09/3"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-25697"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2020-25697"
  ]
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • 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.


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