ubuntu-cve-2021-3935
Vulnerability from osv_ubuntu
Published
2021-11-22 16:15
Modified
2025-10-24 04:49
Summary
Details

When PgBouncer is configured to use "cert" authentication, a man-in-the-middle attacker can inject arbitrary SQL queries when a connection is first established, despite the use of TLS certificate verification and encryption. This flaw affects PgBouncer versions prior to 1.16.1.

Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/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": "pgbouncer",
            "binary_version": "1.7-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "pgbouncer",
        "purl": "pkg:deb/ubuntu/pgbouncer@1.7-1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5.5-1",
        "1.6.1-1",
        "1.7-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "pgbouncer",
            "binary_version": "1.8.1-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "pgbouncer",
        "purl": "pkg:deb/ubuntu/pgbouncer@1.8.1-1build1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.7.2-3build1",
        "1.7.2-65-g2b8e6cf-1",
        "1.8.1-1",
        "1.8.1-1build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "pgbouncer",
            "binary_version": "1.12.0-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "pgbouncer",
        "purl": "pkg:deb/ubuntu/pgbouncer@1.12.0-3?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.10.0-1",
        "1.10.0-1build1",
        "1.11.0-1",
        "1.12.0-2",
        "1.12.0-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "pgbouncer",
            "binary_version": "1.16.1-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "pgbouncer",
        "purl": "pkg:deb/ubuntu/pgbouncer@1.16.1-1ubuntu1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.15.0-1",
        "1.16.1-1ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "details": "When PgBouncer is configured to use \"cert\" authentication, a man-in-the-middle attacker can inject arbitrary SQL queries when a connection is first established, despite the use of TLS certificate verification and encryption. This flaw affects PgBouncer versions prior to 1.16.1.",
  "id": "UBUNTU-CVE-2021-3935",
  "modified": "2025-10-24T04:49:58Z",
  "published": "2021-11-22T16:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3935"
    },
    {
      "type": "REPORT",
      "url": "https://www.pgbouncer.org/2021/11/pgbouncer-1-16-1"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/pgbouncer/pgbouncer/releases/tag/pgbouncer_1_16_1"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/pgbouncer/pgbouncer/commit/e4453c9151a2f5af0a9cb049b302a3f9f9654453"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2021251"
    },
    {
      "type": "REPORT",
      "url": "http://www.pgbouncer.org/changelog.html#pgbouncer-116x"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-3935"
    }
  ],
  "related": [],
  "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:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-3935"
  ]
}



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