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{
"schema_version": "1.7.0",
"id": "USN-5083-1",
"summary": "python3.4, python3.5 vulnerabilities",
"details": "It was discovered that Python incorrectly handled certain RFCs.\nAn attacker could possibly use this issue to cause a denial of service.\nThis issue only affected Ubuntu 16.04 ESM. (CVE-2021-3733)\n\nIt was discovered that Python incorrectly handled certain\nserver responses. An attacker could possibly use this issue to\ncause a denial of service. (CVE-2021-3737)\n",
"aliases": [],
"upstream": [
"UBUNTU-CVE-2021-3733",
"UBUNTU-CVE-2021-3737"
],
"related": [],
"published": "2021-09-16T17:27:34Z",
"modified": "2026-06-29T10:52:51Z",
"affected": [
{
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "python3.4",
"purl": "pkg:deb/ubuntu/python3.4@3.4.3-1ubuntu1~14.04.7+esm11?arch=source&distro=trusty/esm"
},
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.4.3-1ubuntu1~14.04.7+esm11"
}
]
}
],
"versions": [
"3.4~b1-0ubuntu3",
"3.4~b1-4ubuntu4",
"3.4~b1-4ubuntu6",
"3.4~b1-5ubuntu2",
"3.4~b2-1",
"3.4~b3-1ubuntu1",
"3.4~rc1-1build1",
"3.4~rc2-1",
"3.4~rc3-0ubuntu1",
"3.4.0-1",
"3.4.0-2ubuntu1",
"3.4.0-2ubuntu1.1",
"3.4.3-1ubuntu1~14.04.1",
"3.4.3-1ubuntu1~14.04.3",
"3.4.3-1ubuntu1~14.04.4",
"3.4.3-1ubuntu1~14.04.5",
"3.4.3-1ubuntu1~14.04.6",
"3.4.3-1ubuntu1~14.04.7",
"3.4.3-1ubuntu1~14.04.7+esm2",
"3.4.3-1ubuntu1~14.04.7+esm4",
"3.4.3-1ubuntu1~14.04.7+esm6",
"3.4.3-1ubuntu1~14.04.7+esm7",
"3.4.3-1ubuntu1~14.04.7+esm8",
"3.4.3-1ubuntu1~14.04.7+esm10"
],
"ecosystem_specific": {
"binaries": [
{
"binary_name": "idle-python3.4",
"binary_version": "3.4.3-1ubuntu1~14.04.7+esm11"
},
{
"binary_name": "libpython3.4",
"binary_version": "3.4.3-1ubuntu1~14.04.7+esm11"
},
{
"binary_name": "libpython3.4-minimal",
"binary_version": "3.4.3-1ubuntu1~14.04.7+esm11"
},
{
"binary_name": "libpython3.4-stdlib",
"binary_version": "3.4.3-1ubuntu1~14.04.7+esm11"
},
{
"binary_name": "libpython3.4-testsuite",
"binary_version": "3.4.3-1ubuntu1~14.04.7+esm11"
},
{
"binary_name": "python3.4",
"binary_version": "3.4.3-1ubuntu1~14.04.7+esm11"
},
{
"binary_name": "python3.4-examples",
"binary_version": "3.4.3-1ubuntu1~14.04.7+esm11"
},
{
"binary_name": "python3.4-minimal",
"binary_version": "3.4.3-1ubuntu1~14.04.7+esm11"
},
{
"binary_name": "python3.4-venv",
"binary_version": "3.4.3-1ubuntu1~14.04.7+esm11"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
},
"database_specific": {
"cves_map": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"cves": [
{
"id": "CVE-2021-3733",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2021-3737",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
}
]
}
}
},
{
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "python3.5",
"purl": "pkg:deb/ubuntu/python3.5@3.5.2-2ubuntu0~16.04.13+esm1?arch=source&distro=esm-infra/xenial"
},
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.2-2ubuntu0~16.04.13+esm1"
}
]
}
],
"versions": [
"3.5.0-3",
"3.5.0-3ubuntu1",
"3.5.1~rc1-2ubuntu1",
"3.5.1-1",
"3.5.1-2",
"3.5.1-3",
"3.5.1-5",
"3.5.1-6ubuntu1",
"3.5.1-6ubuntu2",
"3.5.1-9ubuntu1",
"3.5.1-10",
"3.5.2-2~16.01",
"3.5.2-2~16.04",
"3.5.2-2ubuntu0~16.04.1",
"3.5.2-2ubuntu0~16.04.2",
"3.5.2-2ubuntu0~16.04.3",
"3.5.2-2ubuntu0~16.04.4",
"3.5.2-2ubuntu0~16.04.5",
"3.5.2-2ubuntu0~16.04.8",
"3.5.2-2ubuntu0~16.04.9",
"3.5.2-2ubuntu0~16.04.10",
"3.5.2-2ubuntu0~16.04.11",
"3.5.2-2ubuntu0~16.04.12",
"3.5.2-2ubuntu0~16.04.13"
],
"ecosystem_specific": {
"binaries": [
{
"binary_name": "idle-python3.5",
"binary_version": "3.5.2-2ubuntu0~16.04.13+esm1"
},
{
"binary_name": "libpython3.5",
"binary_version": "3.5.2-2ubuntu0~16.04.13+esm1"
},
{
"binary_name": "libpython3.5-minimal",
"binary_version": "3.5.2-2ubuntu0~16.04.13+esm1"
},
{
"binary_name": "libpython3.5-stdlib",
"binary_version": "3.5.2-2ubuntu0~16.04.13+esm1"
},
{
"binary_name": "libpython3.5-testsuite",
"binary_version": "3.5.2-2ubuntu0~16.04.13+esm1"
},
{
"binary_name": "python3.5",
"binary_version": "3.5.2-2ubuntu0~16.04.13+esm1"
},
{
"binary_name": "python3.5-examples",
"binary_version": "3.5.2-2ubuntu0~16.04.13+esm1"
},
{
"binary_name": "python3.5-minimal",
"binary_version": "3.5.2-2ubuntu0~16.04.13+esm1"
},
{
"binary_name": "python3.5-venv",
"binary_version": "3.5.2-2ubuntu0~16.04.13+esm1"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
},
"database_specific": {
"cves_map": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"cves": [
{
"id": "CVE-2021-3733",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2021-3737",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
}
]
}
}
}
],
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-5083-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-3733"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-3737"
}
]
}
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