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CVE-2021-4070— Off-by-one Error in v2fly/v2ray-core

Quick assessment

Affected
v2fly v2fly/v2ray-core
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.

v2ray-core是一个用于构建代理以绕过网络限制的平台。 v2ray-core 存在安全漏洞，该漏洞源于 CommandSwitchAccountFactory 中的 DoS 攻击漏洞。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.86% · P56

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-4070

Vulnerability Information
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Vulnerability Title
Off-by-one Error in v2fly/v2ray-core
Source: CVE Program / CVE List V5
Vulnerability Description
Off-by-one Error in GitHub repository v2fly/v2ray-core prior to 4.44.0.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
Off-by-one错误
Source: CVE Program / CVE List V5
Vulnerability Title
v2ray-core 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
v2ray-core是一个用于构建代理以绕过网络限制的平台。 v2ray-core 存在安全漏洞，该漏洞源于 CommandSwitchAccountFactory 中的 DoS 攻击漏洞。
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
v2fly v2fly/v2ray-core unspecified ~ 4.44.0 -

II. Public POCs for CVE-2021-4070

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2021-4070

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Patches & Fixes for CVE-2021-4070 (1)

Vendor Advisories for CVE-2021-4070 (1)

IV. Related Vulnerabilities

Same weakness: CWE-193

V. Comments for CVE-2021-4070

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