What Is a TCP Three-Way Handshake?

The TCP three-way handshake is one of the critical building blocks of the internet. It facilitates the smooth and consistent flow of information across and among different networks without compromising security...

PT-2021-6207 · Microsoft · Defender For Iot

Name of the Vulnerable Software and Affected Versions: Microsoft Defender for IoT affected versions not specified Description: The issue is related to incorrect code generation management in Microsoft Defender for IoT, which can be exploited by a remote attacker to execute arbitrary code using a...

Automatic Cipher Suite Ordering in crypto/tls

This is the first article I wrote for the Go blog !! about how TLS cipher suites configuration got so complicated, and how weve made it way easier in Go 1.17. The Go standard library provides crypto/tls, a robust implementation of Transport Layer Security TLS, the most important security protocol...

CVE-2021-22947

When curl = 7.20.0 and = 7.78.0 connects to an IMAP or POP3 server to retrieve data using STARTTLS to upgrade to TLS security, the server can respond and send back multiple responses at once that curl caches. curl would then upgrade to TLS but not flush the in-queue of cached responses but instea...

CVE-2020-11264

Improper authentication of Non-EAPOL/WAPI plaintext frames during four-way handshake can lead to arbitrary network packet injection in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer Electronics Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT,...

Authentication flaw

Improper authentication of Non-EAPOL/WAPI plaintext frames during four-way handshake can lead to arbitrary network packet injection in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer Electronics Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT,...

CVE-2020-11264

Improper authentication of Non-EAPOL/WAPI plaintext frames during four-way handshake can lead to arbitrary network packet injection in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer Electronics Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT,...

Cisco Web Security Appliance (WSA) Server Name Identification Data Exfiltration (cisco-sa-sni-data-exfil-mFgzXqLN)

According to its self-reported version, Cisco Web Security Appliance WSA is affected by a vulnerability in Server Name Identification SNI request filtering that allows an unauthenticated, remote attacker to bypass filtering technology on an affected device and exfiltrate data from a compromised...

CVE-2021-34433

In Eclipse Californium version 2.0.0 to 2.6.4 and 3.0.0-M1 to 3.0.0-M3, the certificate based x509 and RPK DTLS handshakes accidentally succeeds without verifying the server side's signature on the client side, if that signature is not included in the server's ServerKeyExchange...

CVE-2021-34433

The CVE concerns Eclipse Californium where certificate-based DTLS handshakes (X.509 and RPK) can accidentally succeed without verifying the client-side signature on the server, if the signature is not included in the server’s ServerKeyExchange. Affected versions are 2.0.0–2.6.4 and 3.0.0-M1–3.0.0...

The vulnerability of the Server Name Identification (SNI) component of the Cisco Web Security Appliance internet server, the micro-programming software for Cisco Firepower Threat Defense network firewalls, and the intrusion detection systems allows a malicious actor to gain full control over the compromised host and unauthorized access to protected information.

The vulnerability of the Server Name Identification SNI component of the Cisco Web Security Appliance internet server, as well as the micro-programming software for Cisco Firepower Threat Defense and the intrusion detection system Snort, is related to SSL handshake filtering errors. Exploiting th...

CVE-2021-38459

The data of a network capture of the initial handshake phase can be used to authenticate at a SYSDBA level. If a specific .exe is not restarted often, it is possible to access the needed handshake packets between admin/client connections. Using the SYSDBA permission, an attacker can change user...

CVE-2021-34749

A vulnerability in Server Name Identification SNI request filtering of Cisco Web Security Appliance WSA, Cisco Firepower Threat Defense FTD, and the Snort detection engine could allow an unauthenticated, remote attacker to bypass filtering technology on an affected device and exfiltrate data from...

CVE-2021-34749

A vulnerability in Server Name Identification SNI request filtering of Cisco Web Security Appliance WSA, Cisco Firepower Threat Defense FTD, and the Snort detection engine could allow an unauthenticated, remote attacker to bypass filtering technology on an affected device and exfiltrate data from...

Command injection

A vulnerability in Server Name Identification SNI request filtering of Cisco Web Security Appliance WSA, Cisco Firepower Threat Defense FTD, and the Snort detection engine could allow an unauthenticated, remote attacker to bypass filtering technology on an affected device and exfiltrate data from...

UBUNTU-CVE-2021-34749

A vulnerability in Server Name Identification SNI request filtering of Cisco Web Security Appliance WSA, Cisco Firepower Threat Defense FTD, and the Snort detection engine could allow an unauthenticated, remote attacker to bypass filtering technology on an affected device and exfiltrate data from...

CVE-2021-34749 Multiple Cisco Products Server Name Identification Data Exfiltration Vulnerability

A vulnerability in Server Name Identification SNI request filtering of Cisco Web Security Appliance WSA, Cisco Firepower Threat Defense FTD, and the Snort detection engine could allow an unauthenticated, remote attacker to bypass filtering technology on an affected device and exfiltrate data from...

CVE-2021-34749

A vulnerability in Server Name Identification SNI request filtering of Cisco Web Security Appliance WSA, Cisco Firepower Threat Defense FTD, and the Snort detection engine could allow an unauthenticated, remote attacker to bypass filtering technology on an affected device and exfiltrate data from...

californium-core: DTLS - DoS vulnerability for certificate based handshakes

A flaw was found in californium. The certificate based x509 and RPK DTLS handshakes fails due to the DTLS server side being set to a wrong internal state by a previous certificate based DTLS handshake failure with TLS parameter mismatch. The highest threat from this vulnerability is to system...

PT-2021-3823 · Cisco · Snort +2

Name of the Vulnerable Software and Affected Versions: Cisco Web Security Appliance affected versions not specified Cisco Firepower Threat Defense affected versions not specified Snort detection engine affected versions not specified Description: A vulnerability in Server Name Identification SNI...