CVE-2016-0772 affecting package python-py 1.11.0-1
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 sourcePublished 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"
}