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CVE-2021-36809

Quick assessment

Affected
Sophos SSL VPN client
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.

SSL VPN是采用SSL协议来实现远程接入的一种新型VPN技术。它包括：服务器认证，客户认证、SSL链路上的数据完整性和SSL链路上的数据保密性。 SSL VPN 中存在代码问题漏洞，该漏洞源于产品未对日志路径选择的功能进行有效限制。本地攻击者可利用该漏洞使用管理员权限用VPN客户端日志覆盖系统上的任意文件，可能导致拒绝服务和数据丢失。

CVSS 6.1 · Medium EPSS 0.23% · P13
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I. Basic Information for CVE-2021-36809

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A local attacker can overwrite arbitrary files on the system with VPN client logs using administrator privileges, potentially resulting in a denial of service and data loss, in all versions of Sophos SSL VPN client.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
SSL VPN 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SSL VPN是采用SSL协议来实现远程接入的一种新型VPN技术。它包括：服务器认证，客户认证、SSL链路上的数据完整性和SSL链路上的数据保密性。 SSL VPN 中存在代码问题漏洞，该漏洞源于产品未对日志路径选择的功能进行有效限制。本地攻击者可利用该漏洞使用管理员权限用VPN客户端日志覆盖系统上的任意文件，可能导致拒绝服务和数据丢失。
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
Sophos SSL VPN client unspecified ~ 2.3.8.0 -

II. Public POCs for CVE-2021-36809

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III. Intelligence Information for CVE-2021-36809

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Other References for CVE-2021-36809 (1)

IV. Related Vulnerabilities

Same product: SSL VPN client
Same vendor: Sophos

V. Comments for CVE-2021-36809

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