{"api_version":"1","generated_at":"2026-04-22T23:09:27+00:00","cve":"CVE-2023-34462","urls":{"html":"https://cve.report/CVE-2023-34462","api":"https://cve.report/api/cve/CVE-2023-34462.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2023-34462","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-34462"},"summary":{"title":"CVE-2023-34462","description":"Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. The `SniHandler` can allocate up to 16MB of heap for each channel during the TLS handshake. When the handler or the channel does not have an idle timeout, it can be used to make a TCP server using the `SniHandler` to allocate 16MB of heap. 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.","state":"PUBLIC","assigner":"security-advisories@github.com","published_at":"2023-06-22 23:15:00","updated_at":"2023-11-18 21:15:00"},"problem_types":["CWE-400"],"metrics":[],"references":[{"url":"https://security.netapp.com/advisory/ntap-20230803-0001/","name":"https://security.netapp.com/advisory/ntap-20230803-0001/","refsource":"MISC","tags":[],"title":"CVE-2023-34462 Apache Netty Vulnerability in NetApp Products | NetApp Product Security","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://github.com/netty/netty/commit/535da17e45201ae4278c0479e6162bb4127d4c32","name":"https://github.com/netty/netty/commit/535da17e45201ae4278c0479e6162bb4127d4c32","refsource":"MISC","tags":[],"title":"Merge pull request from GHSA-6mjq-h674-j845 · netty/netty@535da17 · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.debian.org/security/2023/dsa-5558","name":"https://www.debian.org/security/2023/dsa-5558","refsource":"","tags":[],"title":"","mime":"","httpstatus":"200","archivestatus":"404"},{"url":"https://github.com/netty/netty/security/advisories/GHSA-6mjq-h674-j845","name":"https://github.com/netty/netty/security/advisories/GHSA-6mjq-h674-j845","refsource":"MISC","tags":[],"title":"SniHandler 16MB allocation · Advisory · netty/netty · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-34462","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-34462","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2023","cve_id":"34462","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"netty","cpe5":"netty","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2023-34462","qid":"20391","title":"IBM DB2 Denial of Service (DoS) Vulnerability (7087234)"},{"cve":"CVE-2023-34462","qid":"242105","title":"Red Hat Update for JBoss Enterprise Application Platform 7.4.1 on RHEL 9 (RHSA-2023:5486)"},{"cve":"CVE-2023-34462","qid":"242106","title":"Red Hat Update for JBoss Enterprise Application Platform 7.4.1 on RHEL 7 (RHSA-2023:5484)"},{"cve":"CVE-2023-34462","qid":"242122","title":"Red Hat Update for JBoss Enterprise Application Platform 7.4.1 on RHEL 8 (RHSA-2023:5485)"},{"cve":"CVE-2023-34462","qid":"378947","title":"Oracle Coherence October 2023 Critical Patch Update (CPUOCT2023)"},{"cve":"CVE-2023-34462","qid":"6000331","title":"Debian Security Update for netty (DSA 5558-1)"},{"cve":"CVE-2023-34462","qid":"754215","title":"SUSE Enterprise Linux Security Update for netty, netty-tcnative (SUSE-SU-2023:2974-1)"}]},"source_records":{"cve_program":{"data_version":"4.0","data_type":"CVE","data_format":"MITRE","CVE_data_meta":{"ID":"CVE-2023-34462","ASSIGNER":"security-advisories@github.com","STATE":"PUBLIC"},"description":{"description_data":[{"lang":"eng","value":"Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. 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