Security advisory

{
  "id": "c5b713ff25a8e166d8f480c4dae8be998cc2715249e907da6bb30b821a22c151",
  "url": "https://osv.dev/vulnerability/CVE-2020-7957",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-7957",
    "summary": "The IMAP and LMTP components in Dovecot 2.3.9 before 2.3.9.3 mishandle snippet generation when many characters must be read to compute the snippet and a trailing > character exists. This causes a denial of service in which the recipient cannot read all of their messages.",
    "evidence": "osv:CVE-2020-7957",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-7957",
      "aliases": [
        "CVE-2020-7957"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/dovecot/core",
              "type": "GIT",
              "events": [
                {
                  "introduced": "e7f79df9925091027280d88db05fb0135e35e75a"
                },
                {
                  "fixed": "9f41b88fafd73dbc2b33965267425813b9c6456b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.3.9"
                      },
                      {
                        "fixed": "2.3.9.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.3.9.2",
            "2.3.9.1",
            "2.3.9"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-7957.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:56.977931142Z",
      "provider": "osv",
      "references": [
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6XYT55WH372BJOXCJRKBDIFGBMPVOIDT/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NJXHOUT3FH2DJNMACSX4GHPP4MUV4UKA/",
        "https://dovecot.org/security",
        "https://dovecot.org/pipermail/dovecot-news/2020-February/000430.html"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*",
              "cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*"
            ],
            "vendor_product": "fedoraproject:fedora",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "30"
                  },
                  {
                    "last_affected": "30"
                  },
                  {
                    "introduced": "31"
                  },
                  {
                    "last_affected": "31"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2020-7957",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 438764,
  "published_at": "2020-02-12T17:15:12.563+00:00"
}