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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":"0.34868","published_at":"2026-04-08T12:55:00Z"},{"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":"0.34943","published_at":"2026-04-04T12:55:00Z"},{"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":"0.37404","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00164","scoring_system":"epss","scoring_elements":"0.37438","published_at":"2026-04-11T12:55:00Z"},{"value":"0.0019","scoring_system":"epss","scoring_elements":"0.40887","published_at":"2026-04-13T12:55:00Z"}],"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-2022-42252","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://nvd.nist.gov/vuln/detail/CVE-2022-42252"},{"reference_url":"https://security.gentoo.org/glsa/202305-37","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":"SSV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If a sufficient number of such requests were made, an OutOfMemoryException could occur leading to a denial of 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investigating bug 64830 it was discovered that Apache Tomcat 10.0.0-M1 to 10.0.0-M9, 9.0.0-M1 to 9.0.39 and 8.5.0 to 8.5.59 could re-use an HTTP request header value from the previous stream received on an HTTP/2 connection for the request associated with the subsequent stream. While this would most likely lead to an error and the closure of the HTTP/2 connection, it is possible that information could leak between requests.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-17527.json","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-17527.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2020-17527","reference_id":"","reference_type":"","scores":[{"value":"0.10506","scoring_system":"epss","scoring_elements":"0.93254","published_at":"2026-04-13T12:55:00Z"},{"value":"0.10506","scoring_system":"epss","scoring_elements":"0.93253","published_at":"2026-04-12T12:55:00Z"},{"value":"0.10506","scoring_system":"epss","scoring_elements":"0.93255","published_at":"2026-04-11T12:55:00Z"},{"value":"0.10506","scoring_system":"epss","scoring_elements":"0.93251","published_at":"2026-04-09T12:55:00Z"},{"value":"0.10506","scoring_system":"epss","scoring_elements":"0.9324","published_at":"2026-04-04T12:55:00Z"},{"value":"0.10506","scoring_system":"epss","scoring_elements":"0.93235","published_at":"2026-04-02T12:55:00Z"},{"value":"0.10506","scoring_system":"epss","scoring_elements":"0.93226","published_at":"2026-04-01T12:55:00Z"},{"value":"0.10506","scoring_system":"epss","scoring_elements":"0.93247","published_at":"2026-04-08T12:55:00Z"},{"value":"0.10506","scoring_system":"epss","scoring_elements":"0.93238","published_at":"2026-04-07T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2020-17527"},{"reference_url":"https://bz.apache.org/bugzilla/show_bug.cgi?id=64830","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:H/I:N/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://bz.apache.org/bugzilla/show_bug.cgi?id=64830"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","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:H/I:N/A:N"}],"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:H/I:N/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/apache/tomcat"},{"reference_url":"https://github.com/apache/tomcat/commit/21e3408671aac7e0d7e264e720cac8b1b189eb29","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:H/I:N/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/apache/tomcat/commit/21e3408671aac7e0d7e264e720cac8b1b189eb29"},{"reference_url":"https://github.com/apache/tomcat/commit/8d2fe6894d6e258a6d615d7f786acca80e6020cb","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:H/I:N/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/apache/tomcat/commit/8d2fe6894d6e258a6d615d7f786acca80e6020cb"},{"reference_url":"https://github.com/apache/tomcat/commit/d56293f816d6dc9e2b47107f208fa9e95db58c65","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:H/I:N/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/apache/tomcat/commit/d56293f816d6dc9e2b47107f208fa9e95db58c65"},{"reference_url":"https://lists.apache.org/thread.html/r26a2a66339087fc37db3caf201e446d3e83b5cce314371e235ff1784@%3Ccommits.tomee.apache.org%3E","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:H/I:N/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://lists.apache.org/thread.html/r26a2a66339087fc37db3caf201e446d3e83b5cce314371e235ff1784@%3Ccommits.tomee.apache.org%3E"},{"reference_url":"https://lists.apache.org/thread.html/r2d6e05c5ff96f8068a59dfdb3800e9ee8d4e36ce1971783c6e5f9b20@%3Ccommits.tomee.apache.org%3E","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:H/I:N/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://lists.apache.org/thread.html/r2d6e05c5ff96f8068a59dfdb3800e9ee8d4e36ce1971783c6e5f9b20@%3Ccommits.tomee.apache.org%3E"},{"reference_url":"https://lists.apache.org/thread.html/r5a285242737ddef4d338236328aaaf3237183e1465a5efafd16b99ed@%3Cdev.tomcat.apache.org%3E","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an HTTP/2 client connecting to Apache Tomcat 10.0.0-M1 to 10.0.0-M7, 9.0.0.M1 to 9.0.37 or 8.5.0 to 8.5.57 exceeded the agreed maximum number of concurrent streams for a connection (in violation of the HTTP/2 protocol), it was possible that a subsequent request made on that connection could contain HTTP headers - including HTTP/2 pseudo headers - from a previous request rather than the intended headers. 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