QUIC Protocol Security Vulnerabilities

Comprehensive analysis of security vulnerabilities in the QUIC protocol and HTTP/3 implementations

Educational Purpose Only

This content is provided for educational and defensive security purposes. Do not use this information to attack systems you don't own or have explicit permission to test.

Educational Content Warning

This information is provided for educational and defensive purposes only. Do not use this knowledge to attack systems you don't own or have explicit permission to test.

QUIC Protocol Security Vulnerabilities

Comprehensive analysis of security vulnerabilities in the QUIC protocol and HTTP/3 implementations

High/Critical

Medium Severity

Low Severity

Attack Scenarios

Vulnerability Database

Known security vulnerabilities in QUIC protocol and implementations

UDP Amplification Attacks

HIGH

QUIC's UDP foundation can be exploited for DDoS amplification attacks where small requests generate large responses.

Attack Vector: Spoofed UDP packets with victim's IP as sourceImpact: 4 areas

0-RTT Replay Attacks

MEDIUM

Early data sent in 0-RTT connections can be replayed by attackers, potentially causing duplicate operations.

Attack Vector: Replay of captured 0-RTT packetsImpact: 4 areas

Connection Migration Hijacking

MEDIUM

Attackers may attempt to hijack QUIC connections during migration by predicting or manipulating connection IDs.

Attack Vector: Connection ID prediction or manipulation during migrationImpact: 4 areas

Version Downgrade Attacks

MEDIUM

Attackers may force clients to use older, less secure versions of QUIC or fallback to TCP.

Attack Vector: Manipulation of version negotiation packetsImpact: 4 areas

Path Validation Bypass

MEDIUM

Improper path validation implementation may allow attackers to bypass network restrictions or perform routing attacks.

Attack Vector: Manipulation of path validation processImpact: 4 areas

Timing Side-Channel Attacks

LOW

Timing differences in QUIC implementations may leak information about connection state or cryptographic operations.

Attack Vector: Analysis of response timing patternsImpact: 4 areas

Middlebox Interference and Ossification

MEDIUM

Network middleboxes may interfere with QUIC traffic, causing security or availability issues.

Attack Vector: Middlebox manipulation or misconfigurationImpact: 4 areas

Certificate Transparency Information Disclosure

LOW

QUIC's mandatory TLS 1.3 means all certificates are logged in CT, potentially exposing internal infrastructure.

Attack Vector: Certificate Transparency log analysisImpact: 4 areas