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CVE-2025-6703— transport/fc.rs: panic attempting to send MAX_DATA with value larger max varint

Quick assessment

Affected
Mozilla neqo
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mozilla neqo是美国Mozilla基金会的一个Rust协议库。 Mozilla neqo 0.4.24至0.13.2版本存在安全漏洞，该漏洞源于输入验证不当，可能导致崩溃。

AI Predicted 5.3 Difficulty: Theoretical EPSS 0.21% · P12

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-6703

Vulnerability Information
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Vulnerability Title
transport/fc.rs: panic attempting to send MAX_DATA with value larger max varint
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/AU:Y/R:A/RE:L/U:Clear
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Mozilla neqo 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla neqo是美国Mozilla基金会的一个Rust协议库。 Mozilla neqo 0.4.24至0.13.2版本存在安全漏洞，该漏洞源于输入验证不当，可能导致崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mozilla neqo 0.4.24 ~ 0.13.2 -

II. Public POCs for CVE-2025-6703

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III. Intelligence Information for CVE-2025-6703

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IV. Related Vulnerabilities

Same vendor: Mozilla
Same weakness: CWE-20

V. Comments for CVE-2025-6703

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