tlsenum

tlsenum tlsenum は、サーバーがサポートしている TLS 暗号スイートを列挙し、優先順位の高い順にリストアップしようとするコマンドラインツールです。 TLS ClientHello メッセージを送信し、サーバーからの ServerHello 応答を解析することで動作します。 tlsenum は、サーバーがクライアントが示した優先順位を無視して、サーバー側が優先する暗号スイートを決定することを前提としています。これは TLS 仕様で厳密に保証されているわけではありませんが、かなり一般的な実装の詳細のようです。 インストール tlsenum は Python 2.7、3.3、ま...

netty-handler: Netty: Denial of Service due to eager buffer allocation in TLS handshake

A flaw was found in Netty, a network application framework. A remote attacker can exploit this vulnerability by sending a crafted TLS Transport Layer Security ClientHello message. This can lead to an eager allocation of a large memory buffer, causing a Denial of Service DoS due to excessive memor...

cve-2021-3449

CVE-2021-3449 OpenSSL この問題は 2021 年 3 月 17 日に Nokia から OpenSSL に報告されました。修正は Nokia の Peter Kästle と Samuel Sapalski によって開発されました。 対策 既知の修正方法は libssl1.1 を更新することのみです。 一部のアプリケーションはデフォルトで TLS 再ネゴシエーションを無効化する堅牢な TLS 設定を使用していますが、古い OpenSSL バージョンを実行している場合、このバグの影響を受けます。 エクスプロイト...

EUVD-2026-63092

Netty: Fragmented ClientHello records trigger quadratic pre-handshake reassembly in default SNI parsing...

Security update for openssl-1_1-livepatches

This update for openssl-11-livepatches fixes the following issues: CVE-2026-63072: heap buffer overflow in CMS key unwrapping bsc1275133, bsc1274788. HollowByte: DoS vector against OpenSSL TLS ClientHello via remote, attacker-controlled memory allocations bsc1271712, bsc1271713. Patch Instruction...

SUSE-SU-2026:4042-1 Security update for openssl-1_1-livepatches

This update for openssl-11-livepatches fixes the following issues: - CVE-2026-63072: heap buffer overflow in CMS key unwrapping bsc1275133, bsc1274788. - HollowByte: DoS vector against OpenSSL TLS ClientHello via remote, attacker-controlled memory allocations bsc1271712, bsc1271713...

SUSE-SU-2026:4036-1 Security update for openssl-1_1-livepatches

This update for openssl-11-livepatches fixes the following issues: - CVE-2026-63072: heap buffer overflow in CMS key unwrapping bsc1275133, bsc1274788. - HollowByte: DoS vector against OpenSSL TLS ClientHello via remote, attacker-controlled memory allocations bsc1271712, bsc1271713...

Security update for openssl-1_1-livepatches

This update for openssl-11-livepatches fixes the following issues: CVE-2026-63072: heap buffer overflow in CMS key unwrapping bsc1275133, bsc1274788. HollowByte: DoS vector against OpenSSL TLS ClientHello via remote, attacker-controlled memory allocations bsc1271712, bsc1271713. Patch Instruction...

Astra Linux – Vulnerability in mbedtls

A issue was discovered in Mbed TLS 3.5.1. There is a persistent handshake denial if a client sends a TLS 1.3 ClientHello without extensions...

Astra Linux – Vulnerability in mbedtls

A vulnerability was discovered in Mbed TLS before versions 2.28.1 and 3.x, prior to 3.2.0. In some configurations, an unauthenticated attacker can send an invalid ClientHello message to a DTLS server, causing a heap-based buffer overflow of up to 255 bytes. This can lead to a server crash or,...

Linux Distros Unpatched Vulnerability : CVE-2026-75596

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, the default io.netty.handler.ssl.SniHandler...

Improper Check for Unusual or Exceptional Conditions

Overview io.netty:netty-handler is a library that provides an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which...

CVE-2026-75596

Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, the default io.netty.handler.ssl.SniHandler constructors use the pre-handshake ClientHello aggregation path in handler/src/main/java/io/netty/handler/ssl/SslClientHelloHandler.java at...

DEBIAN-CVE-2026-75596

Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, the default io.netty.handler.ssl.SniHandler constructors use the pre-handshake ClientHello aggregation path in handler/src/main/java/io/netty/handler/ssl/SslClientHelloHandler.java at...

CVE-2026-75596

Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, the default io.netty.handler.ssl.SniHandler constructors use the pre-handshake ClientHello aggregation path in handler/src/main/java/io/netty/handler/ssl/SslClientHelloHandler.java at...

UBUNTU-CVE-2026-75596

Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, the default io.netty.handler.ssl.SniHandler constructors use the pre-handshake ClientHello aggregation path in handler/src/main/java/io/netty/handler/ssl/SslClientHelloHandler.java at...

CVE-2026-75595 Netty: SNI Routing Bypass via Fragmented TLS ClientHello Causing Fallback to Default SslContext

Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Fina and 4.2.17.Final, io.netty.handler.ssl.SslClientHelloHandlerdecode checks the wrong offset before reading the four-byte TLS handshake header, so a ClientHello whose handshake header spans records can cause...

CVE-2026-75595 Netty: SNI Routing Bypass via Fragmented TLS ClientHello Causing Fallback to Default SslContext

Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Fina and 4.2.17.Final, io.netty.handler.ssl.SslClientHelloHandlerdecode checks the wrong offset before reading the four-byte TLS handshake header, so a ClientHello whose handshake header spans records can cause...

CVE-2026-75595

Netty (asynchronous, event-driven network framework) is affected by an SNI routing bypass in io.netty.handler.ssl.SslClientHelloHandler#decode . The method checks the wrong offset before reading the four-byte TLS handshake header, so a ClientHello whose handshake header spans records triggers an ...

CVE-2026-75596

In Netty versions before 4.1.137.Final and 4.2.17.Final, the default SniHandler constructors trigger quadratic CPU work in SslClientHelloHandler#decode by recopying the entire handshake buffer for every additional TLS record. An unauthenticated remote attacker can fragment a large ClientHello int...