CVE-2021-33503

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Source
https://cve.org/CVERecord?id=CVE-2021-33503
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-33503.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2021-33503
Aliases
Downstream
Related
Published
2021-06-29T11:15:07.847Z
Modified
2026-05-18T05:53:22.181075130Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
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.

Database specific 
{
    "unresolved_ranges": [
        {
            "vendor_product": "fedoraproject:fedora",
            "source": "CPE_FIELD",
            "cpes": [
                "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*",
                "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*"
            ],
            "extracted_events": [
                {
                    "last_affected": "33"
                },
                {
                    "last_affected": "34"
                }
            ]
        },
        {
            "vendor_product": "oracle:enterprise_manager_ops_center",
            "source": "CPE_FIELD",
            "cpes": [
                "cpe:2.3:a:oracle:enterprise_manager_ops_center:12.4.0.0:*:*:*:*:*:*:*"
            ],
            "extracted_events": [
                {
                    "last_affected": "12.4.0.0"
                }
            ]
        },
        {
            "vendor_product": "oracle:instantis_enterprisetrack",
            "source": "CPE_FIELD",
            "cpes": [
                "cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:*:*:*:*:*:*:*",
                "cpe:2.3:a:oracle:instantis_enterprisetrack:17.2:*:*:*:*:*:*:*",
                "cpe:2.3:a:oracle:instantis_enterprisetrack:17.3:*:*:*:*:*:*:*"
            ],
            "extracted_events": [
                {
                    "last_affected": "17.1"
                },
                {
                    "last_affected": "17.2"
                },
                {
                    "last_affected": "17.3"
                }
            ]
        },
        {
            "vendor_product": "oracle:zfs_storage_appliance_kit",
            "source": "CPE_FIELD",
            "cpes": [
                "cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*"
            ],
            "extracted_events": [
                {
                    "last_affected": "8.8"
                }
            ]
        }
    ]
}
References

Affected packages

Git / github.com/urllib3/urllib3

Affected ranges

Type
GIT
Repo
https://github.com/urllib3/urllib3
Events
Introduced
7e856c04723036934fe314c63701466e4f42d2ee
Fixed
d1616473df94b94f0f5ad19d2a6608cfe93b7cdf
Fixed
2d4a3fee6de2fa45eb82169361918f759269b4ec
Database specific 
{
    "source": [
        "CPE_FIELD",
        "REFERENCES"
    ],
    "cpe": "cpe:2.3:a:python:urllib3:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "1.25.4"
        },
        {
            "fixed": "1.26.5"
        }
    ]
}

Affected versions

1.*
1.25.4
1.25.5
1.25.6
1.25.7
1.25.8
1.26.0
1.26.1
1.26.2
1.26.3
1.26.4

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-33503.json"