{"cve":{"cve_id":"CVE-2021-21330","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.01905,"epss_percentile":0.7704,"epss_as_of":"2026-06-23","description":"aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. In aiohttp before version 3.7.4 there is an open redirect vulnerability. A maliciously crafted link to an aiohttp-based web-server could redirect the browser to a different website. It is caused by a bug in the `aiohttp.web_middlewares.normalize_path_middleware` middleware. This security problem has been fixed in 3.7.4. Upgrade your dependency using pip as follows \"pip install aiohttp >= 3.7.4\". If upgrading is not an option for you, a workaround can be to avoid using `aiohttp.web_middlewares.normalize_path_middleware` in your applications.","published_at":"2021-02-26T02:15:15Z","last_modified_at":null,"cvss_v3_score":3.1,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N","cvss_v3_severity":"LOW","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-601"],"nvd_references":["https://github.com/aio-libs/aiohttp/security/advisories/GHSA-v6wp-4m6f-gcjg","https://github.com/aio-libs/aiohttp/commit/2545222a3853e31ace15d87ae0e2effb7da0c96b","https://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst#374-2021-02-25","https://pypi.org/project/aiohttp/","https://www.debian.org/security/2021/dsa-4864","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN3V7CZJRT4QFCVXB6LDPCJH7NAOFCA5/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FU7ENI54JNEK3PHEFGCE46DGMFNTVU6L/","https://security.gentoo.org/glsa/202208-19"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:14:57.707777Z"},"effective_severity":"LOW","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"H","value_label":"High"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"R","value_label":"Required"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"L","value_label":"Low"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"aio-libs","vendor_name":"aio-libs","product_slug":"aiohttp","product_name":"aiohttp","version_start":"< 3.7.4","version_start_inclusive":true,"version_end":"< 3.7.4","version_end_inclusive":true,"cpe23_uri":"cve5:aio-libs:aiohttp:< 3.7.4:< 3.7.4"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-v6wp-4m6f-gcjg","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/aio-libs/aiohttp/commit/2545222a3853e31ace15d87ae0e2effb7da0c96b","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst#374-2021-02-25","source_type":"MISC","tags":[]},{"url":"https://pypi.org/project/aiohttp/","source_type":"MISC","tags":[]},{"url":"https://www.debian.org/security/2021/dsa-4864","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN3V7CZJRT4QFCVXB6LDPCJH7NAOFCA5/","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FU7ENI54JNEK3PHEFGCE46DGMFNTVU6L/","source_type":"MAILING_LIST","tags":["mailing-list"]},{"url":"https://security.gentoo.org/glsa/202208-19","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2021-02-26T02:15:15Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:05:11.212102Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:05:11.212102Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:05:11.212102Z","label":"CVSS score revised","source":"cvelistv5"}]}