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CVE-2021-20230

Quick assessment

Affected
n/a stunnel
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.

MichałTrojnara Stunnel是 MichałTrojnara开源的一个应用软件。提供TLS加密功能添加到现有客户端和服务器，而无需更改程序代码。 Stunnel 存在信任管理问题漏洞，该漏洞源于使用重定向和verifyChain选项时，客户端证书没有正确验证。以下产品和版本受到影响：stunnel before 5.57

AI Predicted 6.5 Difficulty: Moderate EPSS 1.18% · P68
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I. Basic Information for CVE-2021-20230

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in stunnel before 5.57, where it improperly validates client certificates when it is configured to use both redirect and verifyChain options. This flaw allows an attacker with a certificate signed by a Certificate Authority, which is not the one accepted by the stunnel server, to access the tunneled service instead of being redirected to the address specified in the redirect option. The highest threat from this vulnerability is to confidentiality.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Stunnel 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MichałTrojnara Stunnel是 MichałTrojnara开源的一个应用软件。提供TLS加密功能添加到现有客户端和服务器，而无需更改程序代码。 Stunnel 存在信任管理问题漏洞，该漏洞源于使用重定向和verifyChain选项时，客户端证书没有正确验证。以下产品和版本受到影响：stunnel before 5.57
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
- stunnel stunnel 5.57 -

II. Public POCs for CVE-2021-20230

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III. Intelligence Information for CVE-2021-20230

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Patches & Fixes for CVE-2021-20230 (1)

Vendor Advisories for CVE-2021-20230 (2)

Same Patch Batch · n/a · 2021-02-23 · 56 CVEs total

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CVE-2021-20182 Red Hat openshift4/ose-docker-builder 安全漏洞
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CVE-2021-22112 Vmware VMware Spring Security 权限许可和访问控制问题漏洞
CVE-2020-28587 SoftMaker Office PlanMaker 缓冲区错误漏洞
CVE-2020-7120 Aruba ClearPass Policy Manager 安全漏洞
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CVE-2021-26679 Aruba ClearPass Policy Manager 命令注入漏洞
CVE-2021-26680 Aruba ClearPass Policy Manager 命令注入漏洞
CVE-2021-27582 MITREid Connect 安全漏洞
CVE-2021-26678 Aruba ClearPass Policy Manager Prior 跨站脚本漏洞
CVE-2021-22651 Luxion KeyShot 路径遍历漏洞
CVE-2021-20198 Red Hat OpenShift Container Platform 访问控制错误漏洞

Showing top 20 of 56 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: stunnel
Same vendor: n/a
Same weakness: CWE-295