CVE-2026-20127

CVE-2026-20127 Overview An exploit for the Cisco Catalyst SD-WAN Controller authentication bypass vulnerability, CVE-2026-20127. This exploit targets the vbondprocchallengeackack handler. It sends a forged CHALLENGEACKACK message msgtype=10 with an attacker-controlled verifystatus=1 byte, directl...

CVE-2026-20127-Exploit-Extension

Executive Summary The CVE-2026-20127 Defensive Companion is a premier, enterprise-grade Browser Extension engineered for proactive threat intelligence and defensive analysis. This tool encapsulates authoritative technical research concerning the authentication bypass vulnerability in the Cisco...

org.bouncycastle/bc-java: org.bouncycastle/bctls-fips: Bouncy Castle for Java: Denial of Service via unchecked DTLS handshake reassembler buffer allocation

A flaw was found in Bouncy Castle for Java. The DTLS Datagram Transport Layer Security handshake reassembler allocates buffers based on an unchecked 24-bit length value. A remote attacker could exploit this vulnerability by sending a specially crafted DTLS handshake message, leading to excessive...

org.bouncycastle/bc-java: org.bouncycastle/bctls-fips: Bouncy Castle for Java: Denial of Service via unchecked DTLS handshake reassembler buffer allocation

A flaw was found in Bouncy Castle for Java. The DTLS Datagram Transport Layer Security handshake reassembler allocates buffers based on an unchecked 24-bit length value. A remote attacker could exploit this vulnerability by sending a specially crafted DTLS handshake message, leading to excessive...

org.bouncycastle/bc-java: org.bouncycastle/bctls-fips: Bouncy Castle for Java: Denial of Service via unchecked DTLS handshake reassembler buffer allocation

A flaw was found in Bouncy Castle for Java. The DTLS Datagram Transport Layer Security handshake reassembler allocates buffers based on an unchecked 24-bit length value. A remote attacker could exploit this vulnerability by sending a specially crafted DTLS handshake message, leading to excessive...

org.bouncycastle/bc-java: org.bouncycastle/bctls-fips: Bouncy Castle for Java: Denial of Service via unchecked DTLS handshake reassembler buffer allocation

A flaw was found in Bouncy Castle for Java. The DTLS Datagram Transport Layer Security handshake reassembler allocates buffers based on an unchecked 24-bit length value. A remote attacker could exploit this vulnerability by sending a specially crafted DTLS handshake message, leading to excessive...

Astra Linux – Vulnerability in gnutls28

A flaw in GnuTLS’ DTLS handshake parsing allows for malformed fragments with zero length and non-zero offsets. This leads to an integer underflow during reassembly, resulting in an out-of-bounds read. This issue is remotely exploitable and could cause information disclosure or denial of service...

Astra Linux – vulnerability in gnutls28

A heap buffer overflow vulnerability exists in the DTLS handshake fragment reassembly logic of GnuTLS. The issue arises in mergehandshakepacket, where incoming handshake fragments are matched and merged solely based on their handshake type, without verifying that the messagelength field remains...

CVE-2026-20182

CVE-2026-20182 — Cisco Catalyst SD-WAN Controller / Manager Authentication Bypass A proof-of-concept exploit for CVE-2026-20182 , a critical CVSS 10.0 authentication bypass in the vdaemon DTLS service UDP/12346 on Cisco Catalyst SD-WAN Controller vSmart and Manager vManage. Disclosed: May 14, 202...

CVE-2026-63566

Memory allocation with excessive size value in the DTLS handshake reassembly DtlsReliableHandshake, DtlsReassembler in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote unauthenticated DTLS peer to cause a denial of service through memory exhaustion via crafted handshake...

CVE-2026-63566 DTLS handshake reassembler allocates buffer from unchecked 24-bit length

Memory allocation with excessive size value in the DTLS handshake reassembly DtlsReliableHandshake, DtlsReassembler in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote unauthenticated DTLS peer to cause a denial of service through memory exhaustion via crafted handshake...

SUSE CVE-2026-54887

Use of Default Cryptographic Key vulnerability in Erlang/OTP ssl DTLS server allows predictable DTLS cookie computation during the startup window, enabling source address verification bypass. On DTLS server startup, dtlsserverconnection:initialhello/3 initializes previouscookiesecret to the empty...

CentOS Linux 8 [TuxCare] Security Update: gnutls / gnutls-c++ / gnutls-dane / gnutls-devel / gnutls-utils (CENTOS-STREAM8:CLSA-2026:1778238907)

The CentOS Linux 8 host has packages installed that are affected by a vulnerability as referenced in the TuxCare CENTOS- STREAM8:CLSA-2026:1778238907 advisory. - A flaw in GnuTLS DTLS handshake parsing allows malformed fragments with zero length and non-zero offset, leading to an integer underflo...

CentOS Linux 8.5 [TuxCare] Security Update: gnutls / gnutls-c++ / gnutls-dane / gnutls-devel / gnutls-utils (CENTOS8.5:CLSA-2026:1778172299)

The CentOS Linux 8.5 host has packages installed that are affected by a vulnerability as referenced in the TuxCare CENTOS8.5:CLSA-2026:1778172299 advisory. - A flaw in GnuTLS DTLS handshake parsing allows malformed fragments with zero length and non-zero offset, leading to an integer underflow...

CentOS Linux 8.4 [TuxCare] Security Update: gnutls / gnutls-c++ / gnutls-dane / gnutls-devel / gnutls-utils (CENTOS8.4:CLSA-2026:1778774223)

The CentOS Linux 8.4 host has packages installed that are affected by a vulnerability as referenced in the TuxCare CENTOS8.4:CLSA-2026:1778774223 advisory. - A flaw in GnuTLS DTLS handshake parsing allows malformed fragments with zero length and non-zero offset, leading to an integer underflow...

AlmaLinux 9.2 [TuxCare] Security Update: gnutls / gnutls-c++ / gnutls-dane / gnutls-devel / gnutls-utils (ALMALINUX9.2:CLSA-2026:1778762233)

The AlmaLinux 9.2 host has packages installed that are affected by a vulnerability as referenced in the TuxCare ALMALINUX9.2:CLSA-2026:1778762233 advisory. - A flaw in GnuTLS DTLS handshake parsing allows malformed fragments with zero length and non-zero offset, leading to an integer underflow...

CentOS Linux 7 [TuxCare] Security Update: gnutls / gnutls-c++ / gnutls-dane / gnutls-devel / gnutls-utils (CENTOS7:CLSA-2026:1778240890)

The CentOS Linux 7 host has packages installed that are affected by a vulnerability as referenced in the TuxCare CENTOS7:CLSA-2026:1778240890 advisory. - A flaw in GnuTLS DTLS handshake parsing allows malformed fragments with zero length and non-zero offset, leading to an integer underflow during...

AlmaLinux 9.6 [TuxCare] Security Update: gnutls / gnutls-c++ / gnutls-dane / gnutls-devel / gnutls-utils Multiple Vulnerabilities (ALMALINUX9.6:CLSA-2026:1780484200)

The AlmaLinux 9.6 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1780484200 advisory. - A heap buffer overflow vulnerability exists in the DTLS handshake fragment reassembly logic of GnuTLS. The issue arises in...

AlmaLinux 9.6 [TuxCare] Security Update: gnutls / gnutls-c++ / gnutls-dane / gnutls-devel / gnutls-utils (ALMALINUX9.6:CLSA-2026:1779203444)

The AlmaLinux 9.6 host has packages installed that are affected by a vulnerability as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1779203444 advisory. - A flaw in GnuTLS DTLS handshake parsing allows malformed fragments with zero length and non-zero offset, leading to an integer underflow...

Rocky Linux 9.6 [TuxCare] Security Update: gnutls / gnutls-c++ / gnutls-dane / gnutls-devel / gnutls-utils (ALMALINUX9.6:CLSA-2026:1779203444)

The Rocky Linux 9.6 host has packages installed that are affected by a vulnerability as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1779203444 advisory. - A flaw in GnuTLS DTLS handshake parsing allows malformed fragments with zero length and non-zero offset, leading to an integer underflow...