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vuln-ubuntu/data/osv/cve/2021/UBUNTU-CVE-2021-33503.json
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{
"schema_version": "1.7.0",
"id": "UBUNTU-CVE-2021-33503",
"details": "An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component, the authority regular expression exhibits catastrophic backtracking, causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect.",
"aliases": [],
"upstream": [
"CVE-2021-33503"
],
"related": [
"USN-5812-1"
],
"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": "Ubuntu",
"score": "low"
}
],
"published": "2021-06-29T11:15:00Z",
"modified": "2025-07-18T16:46:51Z",
"affected": [
{
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "python-pip",
"purl": "pkg:deb/ubuntu/python-pip@20.0.2-5ubuntu1.7?arch=source&distro=focal"
},
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "20.0.2-5ubuntu1.7"
}
]
}
],
"versions": [
"18.1-5",
"18.1-5build1",
"18.1-5ubuntu1",
"20.0.2-2",
"20.0.2-4",
"20.0.2-5",
"20.0.2-5ubuntu1",
"20.0.2-5ubuntu1.1",
"20.0.2-5ubuntu1.3",
"20.0.2-5ubuntu1.4",
"20.0.2-5ubuntu1.5",
"20.0.2-5ubuntu1.6"
],
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-pip-whl",
"binary_version": "20.0.2-5ubuntu1.7"
},
{
"binary_name": "python3-pip",
"binary_version": "20.0.2-5ubuntu1.7"
}
],
"availability": "No subscription required"
}
},
{
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "python-urllib3",
"purl": "pkg:deb/ubuntu/python-urllib3@1.25.8-2ubuntu0.2?arch=source&distro=focal"
},
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.25.8-2ubuntu0.2"
}
]
}
],
"versions": [
"1.24.1-1ubuntu1",
"1.24.1-1ubuntu2",
"1.25.8-1",
"1.25.8-2",
"1.25.8-2ubuntu0.1"
],
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-urllib3",
"binary_version": "1.25.8-2ubuntu0.2"
}
],
"availability": "No subscription required"
}
}
],
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-33503"
},
{
"type": "REPORT",
"url": "https://github.com/advisories/GHSA-q2q7-5pp4-w6pg"
},
{
"type": "REPORT",
"url": "https://github.com/urllib3/urllib3/commit/2d4a3fee6de2fa45eb82169361918f759269b4ec"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-5812-1"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-33503"
}
]
}