CVE-2026-44894

Published: Giu 12, 2026 Last Modified: Giu 15, 2026
ExploitDB:
Other exploit source:
Google Dorks:
HIGH 7,5
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: none
Integrity: high
Availability: none

Description

AI Translation Available

Netty is a network application framework for development of protocol servers and clients. NoQuicTokenHandler is the tokenHandler used when the application does not set one. Prior to version 4.2.15.Final, its writeToken() returns false (server will not send Retry — acceptable), but validateToken() unconditionally `return 0`. In QuicheQuicServerCodec.handlePacket(), a non-negative return from validateToken() is interpreted as 'token is valid, ODCID starts at offset 0', causing the server to call quiche_accept as if the client's address had been validated by a Retry round-trip. Per RFC 9000 §8.1, a validated address lifts the 3× anti-amplification send limit. Thus any attacker who includes ANY non-empty token bytes in an Initial packet — with a spoofed victim source IP — causes the Netty server to treat the victim as validated and reflect full-size handshake flights (certificates, etc.) toward it without the 3× cap. The correct 'no token handler' semantics would be to return -1 (invalid) so the normal un-validated path and amplification limit apply. Version 4.2.15.Final patches the issue.

EPSS (Exploit Prediction Scoring System)

Trend Analysis

EPSS (Exploit Prediction Scoring System)

Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.

EPSS Score
0,0002
Percentile
0,0th
Updated

EPSS Score Trend (Last 6 Days)

940

Improper Verification of Source of a Communication Channel

Incomplete
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Access Control Other
Potential Impacts:
Gain Privileges Or Assume Identity Varies By Context Bypass Protection Mechanism
Applicable Platforms
Technologies: Mobile
View CWE Details
Application

Netty by Netty

Product Information
Vendor Netty
Product Netty
Version Range Affected
From 4.2.0 (inclusive)
To 4.2.15 (exclusive)
cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
https://github.com/netty/netty/releases/tag/netty-4.2.15.Fi…
https://github.com/netty/netty/releases/tag/netty-4.2.15.Final
https://github.com/netty/netty/security/advisories/GHSA-cmm…
https://github.com/netty/netty/security/advisories/GHSA-cmm3-54f8-px4j