CVE-2025-6703 Details
Description
Improper Input Validation vulnerability in Mozilla neqo leads to an unexploitable crash..This issue affects neqo: from 0.4.24 through 0.13.2.
A vulnerability in Mozilla neqo, versions 0.4.24 through 0.13.2, allows for improper input validation that results in a crash. This issue arises when a remote server sends a 'DATA_BLOCKED' frame, prompting neqo to respond with a 'MAX_DATA' flow control update. If the value exceeds the maximum allowed by QUIC varint standards, neqo panics, causing a crash in the socket thread and ultimately terminating the main process.
Users can upgrade to neqo version 0.13.3 or later to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jun 26, 2025References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/mozilla/neqo/security/advisories/GHSA-jfv6-x22w-grhf | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
| CWE-20 | Improper Input Validation | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| mozilla neqo | >= 0.4.24, <= 0.13.2 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Dec 3, 2025 | Initial Analysis | [email protected] |
| Jun 26, 2025 | New CVE Received | [email protected] |