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Medium

CVE-2016-0772 affecting package python-py 1.11.0-1

Type: advisorySources: OSV

The smtplib library in CPython (aka Python) before 2.7.12, 3.x before 3.4.5, and 3.5.x before 3.5.2 does not return an error when StartTLS fails, which might allow man-in-the-middle attackers to bypass the TLS protections by leveraging a network position between the client and the registry to block the StartTLS command, aka a "StartTLS stripping attack."

Products
python-py
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2016-0772
Confirmed fixed CVEs
Not specified
Updated in this feed
1 Nov 2026, 17:27 UTC · Revision 1

Source evidence

CVE-2016-0772 affecting package python-py 1.11.0-1

core-osv · Original source

Published 2 Sept 2016, 14:59 UTC

The smtplib library in CPython (aka Python) before 2.7.12, 3.x before 3.4.5, and 3.5.x before 3.5.2 does not return an error when StartTLS fails, which might allow man-in-the-middle attackers to bypass the TLS protections by leveraging a network position between the client and the registry to block the StartTLS command, aka a "StartTLS stripping attack."

osv:AZL-109605

python-py

Fixed versions: Not specified

Complete source record
{
  "id": "c7240aa3c7b5087d8d8d243032fdba2e31103e4882d4034d8b4d0797b66ba10c",
  "url": "https://osv.dev/vulnerability/AZL-109605",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2016-0772 affecting package python-py 1.11.0-1",
    "summary": "The smtplib library in CPython (aka Python) before 2.7.12, 3.x before 3.4.5, and 3.5.x before 3.5.2 does not return an error when StartTLS fails, which might allow man-in-the-middle attackers to bypass the TLS protections by leveraging a network position between the client and the registry to block the StartTLS command, aka a \"StartTLS stripping attack.\"",
    "evidence": "osv:AZL-109605",
    "products": [
      {
        "name": {
          "value": "python-py",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "AZL-109605",
      "aliases": [
        "AZL-109605"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "1.11.0-1"
                }
              ]
            }
          ],
          "package": {
            "name": "python-py",
            "purl": "pkg:rpm/azure-linux/python-py",
            "ecosystem": "Azure Linux:3"
          },
          "database_specific": {
            "source": "https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-109605.json"
          }
        }
      ],
      "modified": "2026-10-27T05:36:16Z",
      "provider": "osv",
      "upstream": [
        "CVE-2016-0772"
      ],
      "references": [
        "https://nvd.nist.gov/vuln/detail/CVE-2016-0772"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2016-0772",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 460491,
  "published_at": "2016-09-02T14:59:00+00:00"
}