Is this vulnerability remotely exploitable?

Yes. Any remote client capable of sending QUIC traffic to a vulnerable endpoint that uses Quicly can potentially trigger the crash by sending specially crafted packets.

What level of access does an attacker need?

The attacker needs only network-level access to the QUIC service. No authentication or local system access is inherently required to attempt exploitation, assuming the endpoint is reachable.

What is the safest general fix pattern?

The safest pattern is to ensure all protocol inputs are thoroughly validated before they affect assertion-guarded logic, and to convert assumptions about external data into explicit, graceful error handling rather than process-terminating assertions.

Severity:

HIGH RISK

(7.5)

Input Validation Flaw (CWE-20) Causing DoS in Quicly QUIC Implementation

CVE-2025-61684

Published:

Jan 19, 2026

Status:

Awaiting Analysis

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-306

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

Account Takeover / Loss of Account Control

February 17, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Remote Code Execution on the Server Host

February 17, 2026

Vulnerability Type

Category:

Input Validation Error

CWE:

CWE-20

Impact:

Denial of Service via Process Crash

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Input Validation Error

CWE:

CWE-20

Impact:

Denial of Service via Process Crash

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

Detect vulnerable code directly in pull requests, so CVEs are fixed before merge.

Get Started

Ship clean & secure code faster

START 14 DAYS FREE TRIAL

BOOK A DEMO

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Input Validation Flaw (CWE-20) Causing DoS in Quicly QUIC Implementation

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Product

Pricing

Company

Legal

Developers

Compare

Product

Pricing

Company

Legal

Developers

Compare

Product

Pricing

Company

Legal

Developers

Compare