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The `SniHandler` class is a handler that waits for the TLS handshake to configure a `SslHandler` according to the indicated server name by the `ClientHello` record. For this matter it allocates a `ByteBuf` using the value defined in the `ClientHello` record. Normally the value of the packet should be smaller than the handshake packet but there are not checks done here and the way the code is written, it is possible to craft a packet that makes the `SslClientHelloHandler`. This vulnerability has been fixed in version 4.1.94.Final.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-34462.json","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-34462.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2023-34462","reference_id":"","reference_type":"","scores":[{"value":"0.00998","scoring_system":"epss","scoring_elements":"0.77052","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00998","scoring_system":"epss","scoring_elements":"0.77038","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00998","scoring_system":"epss","scoring_elements":"0.77032","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00998","scoring_system":"epss","scoring_elements":"0.76997","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00998","scoring_system":"epss","scoring_elements":"0.77005","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00998","scoring_system":"epss","scoring_elements":"0.77002","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00998","scoring_system":"epss","scoring_elements":"0.76961","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00998","scoring_system":"epss","scoring_elements":"0.76966","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00998","scoring_system":"epss","scoring_elements":"0.76902","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00998","scoring_system":"epss","scoring_elements":"0.76986","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00998","scoring_system":"epss","scoring_elements":"0.76959","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00998","scoring_system":"epss","scoring_elements":"0.76948","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00998","scoring_system":"epss","scoring_elements":"0.76915","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00998","scoring_system":"epss","scoring_elements":"0.76933","published_at":"2026-04-04T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2023-34462"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-34462","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-34462"},{"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:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://github.com/netty/netty","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/netty/netty"},{"reference_url":"https://github.com/netty/netty/commit/535da17e45201ae4278c0479e6162bb4127d4c32","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-07-16T18:36:13Z/"}],"url":"https://github.com/netty/netty/commit/535da17e45201ae4278c0479e6162bb4127d4c32"},{"reference_url":"https://security.netapp.com/advisory/ntap-20230803-0001","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://security.netapp.com/advisory/ntap-20230803-0001"},{"reference_url":"https://security.netapp.com/advisory/ntap-20240621-0007","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://security.netapp.com/advisory/ntap-20240621-0007"},{"reference_url":"https://www.debian.org/security/2023/dsa-5558","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-07-16T18:36:13Z/"}],"url":"https://www.debian.org/security/2023/dsa-5558"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1038947","reference_id":"1038947","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1038947"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=221688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