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vulnerability in Apache Tomcat allows an attacker to remotely trigger a denial of service. 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. This issue affects Apache Tomcat 10.0.3 to 10.0.4; 9.0.44; 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nerablecode.io/api/vulnerabilities/4452?format=json","vulnerability_id":"VCID-nmq2-8ysj-4fbc","summary":"If 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header.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2022-42252.json","reference_id":"","reference_type":"","scores":[{"value":"4.8","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2022-42252.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2022-42252","reference_id":"","reference_type":"","scores":[{"value":"0.00145","scoring_system":"epss","scoring_elements":"0.34917","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00145","scoring_system":"epss","scoring_elements":"0.34943","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00145","scoring_system":"epss","scoring_elements":"0.34823","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00145","scoring_system":"epss","scoring_elements":"0.34868","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00145","scoring_system":"epss","scoring_elements":"0.34895","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00164","scoring_system":"epss","scoring_elements":"0.37438","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00164","scoring_system":"epss","scoring_elements":"0.37404","published_at":"2026-04-12T12:55:00Z"},{"value":"0.0019","scoring_system":"epss","scoring_elements":"0.40929","published_at":"2026-04-16T12:55:00Z"},{"value":"0.0019","scoring_system":"epss","scoring_elements":"0.40887","published_at":"2026-04-13T12:55:00Z"},{"value":"0.0019","scoring_system":"epss","scoring_elements":"0.40818","published_at":"2026-04-21T12:55:00Z"},{"value":"0.0019","scoring_system":"epss","scoring_elements":"0.40726","published_at":"2026-04-24T12:55:00Z"},{"value":"0.0019","scoring_system":"epss","scoring_elements":"0.40714","published_at":"2026-04-26T12:55:00Z"},{"value":"0.0019","scoring_system":"epss","scoring_elements":"0.40631","published_at":"2026-04-29T12:55:00Z"},{"value":"0.0019","scoring_system":"epss","scoring_elements":"0.40898","published_at":"2026-04-18T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2022-42252"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/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":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/apache/tomcat"},{"reference_url":"https://github.com/apache/tomcat/commit/0d089a15047faf9cb3c82f80f4d28febd4798920","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/apache/tomcat/commit/0d089a15047faf9cb3c82f80f4d28febd4798920"},{"reference_url":"https://github.com/apache/tomcat/commit/4c7f4fd09d2cc1692112ef70b8ee23a7a037ae77","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/apache/tomcat/commit/4c7f4fd09d2cc1692112ef70b8ee23a7a037ae77"},{"reference_url":"https://github.com/apache/tomcat/commit/a1c07906d8dcaf7957e5cc97f5cdbac7d18a205a","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/apache/tomcat/commit/a1c07906d8dcaf7957e5cc97f5cdbac7d18a205a"},{"reference_url":"https://github.com/apache/tomcat/commit/c9fe754e5d17e262dfbd3eab2a03ca96ff372dc3","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/apache/tomcat/commit/c9fe754e5d17e262dfbd3eab2a03ca96ff372dc3"},{"reference_url":"https://lists.apache.org/thread/zzcxzvqfdqn515zfs3dxb7n8gty589sq","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-05-06T15:08:43Z/"}],"url":"https://lists.apache.org/thread/zzcxzvqfdqn515zfs3dxb7n8gty589sq"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-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