ubuntu-cve-2021-32920
Vulnerability from osv_ubuntu
Published
2021-05-13 16:15
Modified
2025-10-24 04:50
Summary
Details

Prosody before 0.11.9 allows Uncontrolled CPU Consumption via a flood of SSL/TLS renegotiation requests.

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

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "prosody",
            "binary_version": "0.9.10-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "prosody",
        "purl": "pkg:deb/ubuntu/prosody@0.9.10-1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.9.8-1",
        "0.9.9-1",
        "0.9.10-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "prosody",
            "binary_version": "0.10.0-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "prosody",
        "purl": "pkg:deb/ubuntu/prosody@0.10.0-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.9.12-2",
        "0.10.0-1",
        "0.10.0-1build1",
        "0.10.0-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "prosody",
            "binary_version": "0.11.4-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "prosody",
        "purl": "pkg:deb/ubuntu/prosody@0.11.4-1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.11.2-1",
        "0.11.3-1",
        "0.11.4-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "prosody",
            "binary_version": "0.11.13-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "prosody",
        "purl": "pkg:deb/ubuntu/prosody@0.11.13-1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.11.10-1",
        "0.11.10-1build1",
        "0.11.10-1build2",
        "0.11.11-1",
        "0.11.11-2",
        "0.11.12-1",
        "0.11.13-1"
      ]
    }
  ],
  "aliases": [],
  "details": "Prosody before 0.11.9 allows Uncontrolled CPU Consumption via a flood of SSL/TLS renegotiation requests.",
  "id": "UBUNTU-CVE-2021-32920",
  "modified": "2025-10-24T04:50:21Z",
  "published": "2021-05-13T16:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-32920"
    },
    {
      "type": "REPORT",
      "url": "https://www.openwall.com/lists/oss-security/2021/05/13/1"
    },
    {
      "type": "REPORT",
      "url": "https://prosody.im/security/advisory_20210512.txt"
    },
    {
      "type": "REPORT",
      "url": "https://hg.prosody.im/trunk/rev/55ef50d6cf65"
    },
    {
      "type": "REPORT",
      "url": "https://hg.prosody.im/trunk/rev/5a484bd050a7"
    },
    {
      "type": "REPORT",
      "url": "https://hg.prosody.im/trunk/rev/aaf9c6b6d18d"
    },
    {
      "type": "REPORT",
      "url": "https://blog.prosody.im/prosody-0.11.9-released/"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-32920"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-32920"
  ]
}



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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.

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.
  • 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.


Detection rules are retrieved from Rulezet.