Security advisory

{
  "id": "659dfbfced1a176b6215c6e59eff80db9a3667b8d613aaf33b920af4cef37d82",
  "url": "https://osv.dev/vulnerability/CVE-2020-15953",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-15953",
    "summary": "LibEtPan through 1.9.4, as used in MailCore 2 through 0.6.3 and other products, has a STARTTLS buffering issue that affects IMAP, SMTP, and POP3. When a server sends a \"begin TLS\" response, the client reads additional data (e.g., from a meddler-in-the-middle attacker) and evaluates it in a TLS context, aka \"response injection.\"",
    "evidence": "osv:CVE-2020-15953",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2020-15953",
      "aliases": [
        "CVE-2020-15953"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/dinhvh/libetpan",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "a6e6fb1b9d298c690db2eafb48a853e5b26c68d5"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:libetpan_project:libetpan:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.9.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.9.4",
            "1.9.3",
            "1.9.2",
            "1.9.1",
            "1.9",
            "1.8",
            "1.7.2",
            "1.7",
            "1.6",
            "1.5",
            "1.4.1",
            "1.4",
            "1.3.pre2",
            "1.3.pre1",
            "1.2.pre1",
            "1.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-15953.json"
          }
        },
        {
          "ranges": [
            {
              "repo": "https://github.com/mailcore/mailcore2",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "908b76857254dddfb07a74dd0e407e10d0900dd5"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:libmailcore:mailcore2:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.6.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.6.3",
            "0.6.2",
            "0.6.1",
            "0.6",
            "0.5.1",
            "0.5",
            "0.3.pre1",
            "0.2",
            "0.2.pre1",
            "0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-15953.json"
          }
        }
      ],
      "modified": "2026-10-24T10:47:48.521517268Z",
      "provider": "osv",
      "references": [
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M65FVH5XPS23NLHFN3ABEGBSCHZAISXN/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QFBWNA5REI5ZGW2DAOEAVHM23MOU6O5J/",
        "https://lists.debian.org/debian-lts-announce/2020/08/msg00026.html",
        "https://security.gentoo.org/glsa/202007-55",
        "https://github.com/dinhvh/libetpan/issues/386"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "9.0"
                  },
                  {
                    "last_affected": "9.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*",
              "cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*"
            ],
            "vendor_product": "fedoraproject:fedora",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "31"
                  },
                  {
                    "last_affected": "31"
                  },
                  {
                    "introduced": "32"
                  },
                  {
                    "last_affected": "32"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2020-15953",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 441562,
  "published_at": "2020-07-27T07:15:10.91+00:00"
}