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La mayor amenaza que supone este fallo es para la disponibilidad de la aplicaci\u00f3n"}], "id": "CVE-2021-3733", "lastModified": "2026-10-14T10:17:47.417", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "PARTIAL", "baseScore": 4.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:S/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 8.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-3733", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-08T20:57:59.983466Z", "version": "2.0.3"}}]}, "published": "2022-03-10T17:42:59.623", "references": [{"source": "secalert@redhat.com", "tags": ["Exploit", "Issue Tracking", "Patch", "Vendor Advisory"], "url": "https://bugs.python.org/issue43075"}, {"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1995234"}, {"source": "secalert@redhat.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/python/cpython/commit/7215d1ae25525c92b026166f9d5cac85fb"}, {"source": "secalert@redhat.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/python/cpython/pull/24391"}, {"source": "secalert@redhat.com", "url": "https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html"}, {"source": "secalert@redhat.com", "url": "https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20220407-0001/"}, {"source": "secalert@redhat.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://ubuntu.com/security/CVE-2021-3733"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Issue Tracking", "Patch", "Vendor Advisory"], "url": "https://bugs.python.org/issue43075"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1995234"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/python/cpython/commit/7215d1ae25525c92b026166f9d5cac85fb"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/python/cpython/pull/24391"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20220407-0001/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://ubuntu.com/security/CVE-2021-3733"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-398330.html"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "secalert@redhat.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-400"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2021:4057", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "python3-0:3.6.8-39.el8_4", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-11-02T00:00:00Z"}, {"advisory": "RHSA-2021:4160", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "python39:3.9-8050020210811100211.d428a79b", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-11-09T00:00:00Z"}, {"advisory": "RHSA-2021:4160", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "python39-devel:3.9-8050020210811100211.d428a79b", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-11-09T00:00:00Z"}, {"advisory": "RHSA-2022:1764", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "python38:3.8-8060020220120164031.5294be16", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-05-10T00:00:00Z"}, {"advisory": "RHSA-2022:1764", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "python38-devel:3.8-8060020220120164031.5294be16", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-05-10T00:00:00Z"}, {"advisory": "RHSA-2022:1821", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "python27:2.7-8060020220210185952.8cdc2268", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-05-10T00:00:00Z"}, {"advisory": "RHSA-2021:4057", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "python3-0:3.6.8-39.el8_4", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-11-02T00:00:00Z"}, {"advisory": "RHSA-2021:3254", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "rh-python38-babel-0:2.7.0-12.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7", "release_date": "2021-08-24T00:00:00Z"}, {"advisory": "RHSA-2021:3254", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "rh-python38-python-0:3.8.11-2.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7", "release_date": "2021-08-24T00:00:00Z"}, {"advisory": "RHSA-2021:3254", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "rh-python38-python-cryptography-0:2.8-5.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7", "release_date": "2021-08-24T00:00:00Z"}, {"advisory": "RHSA-2021:3254", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "rh-python38-python-jinja2-0:2.10.3-6.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7", "release_date": "2021-08-24T00:00:00Z"}, {"advisory": "RHSA-2021:3254", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "rh-python38-python-lxml-0:4.4.1-7.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7", "release_date": "2021-08-24T00:00:00Z"}, {"advisory": "RHSA-2021:3254", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "rh-python38-python-pip-0:19.3.1-2.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7", "release_date": "2021-08-24T00:00:00Z"}, {"advisory": "RHSA-2021:3254", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "rh-python38-python-urllib3-0:1.25.7-7.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7", "release_date": "2021-08-24T00:00:00Z"}, {"advisory": "RHSA-2022:1663", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "python27-python-0:2.7.18-4.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7", "release_date": "2022-05-02T00:00:00Z"}, {"advisory": "RHSA-2021:3254", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "rh-python38-babel-0:2.7.0-12.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS", "release_date": "2021-08-24T00:00:00Z"}, {"advisory": "RHSA-2021:3254", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "rh-python38-python-0:3.8.11-2.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS", "release_date": "2021-08-24T00:00:00Z"}, {"advisory": "RHSA-2021:3254", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "rh-python38-python-cryptography-0:2.8-5.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS", "release_date": "2021-08-24T00:00:00Z"}, {"advisory": "RHSA-2021:3254", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "rh-python38-python-jinja2-0:2.10.3-6.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS", "release_date": "2021-08-24T00:00:00Z"}, {"advisory": "RHSA-2021:3254", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "rh-python38-python-lxml-0:4.4.1-7.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS", "release_date": "2021-08-24T00:00:00Z"}, {"advisory": "RHSA-2021:3254", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "rh-python38-python-pip-0:19.3.1-2.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS", "release_date": "2021-08-24T00:00:00Z"}, {"advisory": "RHSA-2021:3254", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "rh-python38-python-urllib3-0:1.25.7-7.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS", "release_date": "2021-08-24T00:00:00Z"}], "bugzilla": {"description": "python: urllib: Regular expression DoS in AbstractBasicAuthHandler", "id": "1995234", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1995234"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-400", "details": ["There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the server to the client. The greatest threat that this flaw poses is to application availability.", "There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the server to the client. The greatest threat that this flaw poses is to application availability."], "name": "CVE-2021-3733", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "python", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "python", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "python3", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "python36:3.6/python36", "product_name": "Red Hat Enterprise Linux 8"}], "public_date": "2021-08-10T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-3733\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-3733\nhttps://docs.python.org/3.6/whatsnew/changelog.html#python-3-6-14-final\nhttps://docs.python.org/3.7/whatsnew/changelog.html#python-3-7-11-final\nhttps://docs.python.org/3.8/whatsnew/changelog.html#python-3-8-10-final\nhttps://docs.python.org/3.9/whatsnew/changelog.html#python-3-9-5-final"], "statement": "Applications that use AbstractBasicAuthHandler, HTTPBasicAuthHandler and ProxyBasicAuthHandler may be affected by this flaw. Other classes may use the vulnerable method http_error_auth_reqed in AbstractBasicAuthHandler as well.\nThis flaw is out of support scope for versions of Python shipped in Red Hat Enterprise Linux 7 base OS and Red Hat Enterprise Linux 6. For more information about support life cycles, please see https://access.redhat.com/support/policy/updates/errata/", "threat_severity": "Moderate"}