Security advisory

{
  "id": "4f32f0d864420647f5ae1536097e2804ebe838331fcec19549fe8c7f4a369b20",
  "url": "https://osv.dev/vulnerability/CVE-2017-2669",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2017-2669",
    "summary": "Dovecot before version 2.2.29 is vulnerable to a denial of service. When 'dict' passdb and userdb were used for user authentication, the username sent by the IMAP/POP3 client was sent through var_expand() to perform %variable expansion. Sending specially crafted %variable fields could result in excessive memory usage causing the process to crash (and restart), or excessive CPU usage causing all authentications to hang.",
    "evidence": "osv:CVE-2017-2669",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2017-2669",
      "aliases": [
        "CVE-2017-2669"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/dovecot/core",
              "type": "GIT",
              "events": [
                {
                  "introduced": "54d654098032d96975b70749b505fae538e97f7a"
                },
                {
                  "last_affected": "bed84341d457ca12b3ffc2789f5ce5a50f473c17"
                },
                {
                  "fixed": "000030feb7a30f193197f1aab8a7b04a26b42735"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.2.26"
                      },
                      {
                        "last_affected": "2.2.28"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "000030feb7a30f193197f1aab8a7b04a26b42735"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-2669.json",
            "vanir_signatures": [
              {
                "id": "CVE-2017-2669-8b3a137b",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "267636158964568098863636960298466532724",
                    "2352569610556384996954443346264017109",
                    "93946251500024901057239984742115296506",
                    "24637658557778190796647398033891828969",
                    "211611469493583939446357562940970616992",
                    "278277978705547623851111021639629407269",
                    "124382171383543376698073773677944138094",
                    "187087530198002650493950430766339868348",
                    "162450648597069746051999601511029220517"
                  ]
                },
                "source": "https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735",
                "target": {
                  "file": "src/auth/db-dict.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2017-2669-a636a152",
                "digest": {
                  "length": 1242,
                  "function_hash": "258390715530272175125914701927623207390"
                },
                "source": "https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735",
                "target": {
                  "file": "src/auth/db-dict.c",
                  "function": "db_dict_iter_lookup_key_values"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T13:21:50Z"
          }
        }
      ],
      "modified": "2026-10-20T13:21:50.961466323Z",
      "provider": "osv",
      "references": [
        "https://dovecot.org/pipermail/dovecot-news/2017-April/000341.html",
        "https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735.patch",
        "https://www.debian.org/security/2017/dsa-3828",
        "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2669"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "8.0"
                  },
                  {
                    "last_affected": "8.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2017-2669",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 387563,
  "published_at": "2018-06-21T13:29:00.317+00:00"
}