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An error introduced as part of a change to improve error handling during non-blocking I/O meant that the error flag associated with the Request object was not reset between requests. This meant that once a non-blocking I/O error occurred, all future requests handled by that request object would fail. Users were able to trigger non-blocking I/O errors, e.g. by dropping a connection, thereby creating the possibility of triggering a DoS. Applications that do not use non-blocking I/O are not exposed to this vulnerability. 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This issue affects Apache Tomcat 10.0.0-M1 to 10.0.5; 9.0.0.M1 to 9.0.45; 8.5.0 to 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fix for CVE-2020-9484 was incomplete. When using Apache Tomcat 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41, 8.5.0 to 8.5.61 or 7.0.0. to 7.0.107 with a configuration edge case that was highly unlikely to be used, the Tomcat instance was still vulnerable to CVE-2020-9494. Note that both the previously published prerequisites for CVE-2020-9484 and the previously published mitigations for CVE-2020-9484 also apply to this issue.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-25329.json","reference_id":"","reference_type":"","scores":[{"value":"7.0","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-25329.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-25329","reference_id":"","reference_type":"","scores":[{"value":"0.01001","scoring_system":"epss","scoring_elements":"0.77073","published_at":"2026-05-05T12:55:00Z"},{"value":"0.01001","scoring_system":"epss","scoring_elements":"0.77082","published_at":"2026-04-29T12:55:00Z"},{"value":"0.01001","scoring_system":"epss","scoring_elements":"0.77068","published_at":"2026-04-26T12:55:00Z"},{"value":"0.01001","scoring_system":"epss","scoring_elements":"0.77062","published_at":"2026-04-24T12:55:00Z"},{"value":"0.01001","scoring_system":"epss","scoring_elements":"0.77027","published_at":"2026-04-21T12:55:00Z"},{"value":"0.01001","scoring_system":"epss","scoring_elements":"0.77034","published_at":"2026-04-18T12:55:00Z"},{"value":"0.01001","scoring_system":"epss","scoring_elements":"0.76928","published_at":"2026-04-01T12:55:00Z"},{"value":"0.01001","scoring_system":"epss","scoring_elements":"0.77031","published_at":"2026-04-16T12:55:00Z"},{"value":"0.01001","scoring_system":"epss","scoring_elements":"0.7699","published_at":"2026-04-13T12:55:00Z"},{"value":"0.01001","scoring_system":"epss","scoring_elements":"0.76995","published_at":"2026-04-12T12:55:00Z"},{"value":"0.01001","scoring_system":"epss","scoring_elements":"0.77016","published_at":"2026-04-11T12:55:00Z"},{"value":"0.01001","scoring_system":"epss","scoring_elements":"0.76989","published_at":"2026-04-09T12:55:00Z"},{"value":"0.01001","scoring_system":"epss","scoring_elements":"0.76978","published_at":"2026-04-08T12:55:00Z"},{"value":"0.01001","scoring_system":"epss","scoring_elements":"0.76946","published_at":"2026-04-07T12:55:00Z"},{"value":"0.01001","scoring_system":"epss","scoring_elements":"0.76964","published_at":"2026-04-04T12:55:00Z"},{"value":"0.01001","scoring_system":"epss","scoring_elements":"0.76934","published_at":"2026-04-02T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-25329"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"7","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://github.com/apache/tomcat","reference_id":"","reference_type":"","scores":[{"value":"7.0","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/apache/tomcat"},{"reference_url":"https://github.com/apache/tomcat/commit/4785433a226a20df6acbea49296e1ce7e23de453","reference_id":"","reference_type":"","scores":[],"url":"https://github.com/apache/tomcat/commit/4785433a226a20df6acbea49296e1ce7e23de453"},{"reference_url":"https://github.com/apache/tomcat/commit/6d66e99ef85da93e4d2c2a536ca51aa3418bfaf4","reference_id":"","reference_type":"","scores":[{"value":"7.0","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/apache/tomcat/commit/6d66e99ef85da93e4d2c2a536ca51aa3418bfaf4"},{"reference_url":"https://github.com/apache/tomcat/commit/74b105657ffbd1d1de80455f03446c3bbf30d1f5","reference_id":"","reference_type":"","scores":[],"url":"https://github.com/apache/tomcat/commit/74b105657ffbd1d1de80455f03446c3bbf30d1f5"},{"reference_url":"https://github.com/apache/tomcat/commit/93f0cc403a9210d469afc2bd9cf03ab3251c6f35","reference_id":"","reference_type":"","scores":[],"url":"https://github.com/apache/tomcat/commit/93f0cc403a9210d469afc2bd9cf03ab3251c6f35"},{"reference_url":"https://lists.apache.org/thread.html/r11ce01e8a4c7269b88f88212f21830edf73558997ac7744f37769b77@%3Cusers.tomcat.apache.org%3E","reference_id":"","reference_type":"","scores":[{"value":"7.0","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://lists.apache.org/thread.html/r11ce01e8a4c7269b88f88212f21830edf73558997ac7744f37769b77@%3Cusers.tomcat.apache.org%3E"},{"reference_url":"https://lists.apache.org/thread.html/r732b2ca289dc02df2de820e8775559abd6c207f159e39f559547a085@%3Cusers.tomcat.apache.org%3E","reference_id":"","reference_type":"","scores":[{"value":"7.0","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"u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