Security advisory

{
  "id": "b9a5c0ad104b08ae1270b33d291de248e5e98a66c79d6cceca75d0cce1253ad5",
  "url": "https://osv.dev/vulnerability/CVE-2019-19977",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2019-19977",
    "summary": "libESMTP through 1.0.6 mishandles domain copying into a fixed-size buffer in ntlm_build_type_2 in ntlm/ntlmstruct.c, as demonstrated by a stack-based buffer over-read.",
    "evidence": "osv:CVE-2019-19977",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2019-19977",
      "aliases": [
        "CVE-2019-19977"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/jbouse-debian/libesmtp",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "ca5bd0800ef1da234315da4c59716568eb5e6402"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:libesmtp_project:libesmtp:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.0.6"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "upstream/1.0.6",
            "upstream/1.0.4"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-19977.json"
          }
        }
      ],
      "modified": "2026-10-20T10:50:53.239620070Z",
      "provider": "osv",
      "references": [
        "https://web.archive.org/web/20190528215510/http://brianstafford.info/libesmtp/",
        "https://github.com/Kirin-say/Vulnerabilities/blob/master/Stack_Overflow_in_libesmtp.md",
        "https://github.com/jbouse-debian/libesmtp/blob/ca5bd0800ef1da234315da4c59716568eb5e6402/ntlm/ntlmstruct.c#L228-L242"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2019-19977",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 382318,
  "published_at": "2019-12-26T01:15:10.973+00:00"
}