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CVE-2021-4234

Quick assessment

Affected
n/a OpenVPN Access Server
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.

OpenVPN是美国OpenVPN公司的一个用于创建虚拟专用网络（VPN）加密通道的软件包，它使用OpenSSL库来加密数据与控制信息，并允许创建的VPN使用公开密钥、电子证书或者用户名/密码来进行身份验证。 OpenVPN Access Server 2.10 版本及之前版本存在安全漏洞，该漏洞源于服务器会重新发送多个数据包以响应客户端发送的重置数据包，而客户端再次没有响应，从而导致有限放大攻击。

AI Predicted 6.5 Difficulty: Easy EPSS 0.89% · P58

Possible ATT&CK Techniques 1 AI

T1498.002 · Reflection Amplification
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I. Basic Information for CVE-2021-4234

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
OpenVPN Access Server 2.10 and prior versions are susceptible to resending multiple packets in a response to a reset packet sent from the client which the client again does not respond to, resulting in a limited amplification attack.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
对网络消息容量的控制不充分(网络放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
OpenVPN 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenVPN是美国OpenVPN公司的一个用于创建虚拟专用网络（VPN）加密通道的软件包，它使用OpenSSL库来加密数据与控制信息，并允许创建的VPN使用公开密钥、电子证书或者用户名/密码来进行身份验证。 OpenVPN Access Server 2.10 版本及之前版本存在安全漏洞，该漏洞源于服务器会重新发送多个数据包以响应客户端发送的重置数据包，而客户端再次没有响应，从而导致有限放大攻击。
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
- OpenVPN Access Server 2.10 and prior version -

II. Public POCs for CVE-2021-4234

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III. Intelligence Information for CVE-2021-4234

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Other References for CVE-2021-4234 (1)

Same Patch Batch · n/a · 2022-07-06 · 30 CVEs total

CVE-2022-24141 iTop VPN 安全漏洞
CVE-2022-2318 Linux kernel 资源管理错误漏洞
CVE-2022-32290 Northern.tech Mender 安全漏洞
CVE-2022-30591 quic-go 资源管理错误漏洞
CVE-2022-32386 Tenda AC23 缓冲区错误漏洞
CVE-2022-32385 Tenda AC23 缓冲区错误漏洞
CVE-2022-32383 Tenda AC23 缓冲区错误漏洞
CVE-2021-31676 PESCMS 跨站脚本漏洞
CVE-2021-31677 PESCMS 跨站请求伪造漏洞
CVE-2021-31679 PESCMS 跨站请求伪造漏洞
CVE-2021-31678 PESCMS 跨站请求伪造漏洞
CVE-2022-28935 多款TOTOLINK产品命令注入漏洞
CVE-2022-24138 IOBit Advanced System Care (Asc.exe) 15、Action Download Center 安全漏洞
CVE-2022-24139 IOBit Advanced System Care Free 安全漏洞
CVE-2022-24140 多款IOBit产品安全漏洞
CVE-2014-8164 Red Hat CloudForms Management Engine 信任管理问题漏洞
CVE-2022-30929 Mini-Tmall 安全漏洞
CVE-2021-3695 grub2 缓冲区错误漏洞
CVE-2021-3696 grub2 缓冲区错误漏洞
CVE-2021-3697 grub2 缓冲区错误漏洞

Showing top 20 of 30 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: OpenVPN Access Server
Same vendor: n/a
Same weakness: CWE-406

V. Comments for CVE-2021-4234

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