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CVE-2021-27241

Quick assessment

Affected
Avast Premium Security
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.

Avast Premium Security是捷克Avast公司的一个应用软件。用于全面扫描网站漏洞。 Avast Premium Security 20.8.2429 存在安全漏洞，攻击者可利用该漏洞可以滥用该服务来删除目录。

AI Predicted 6.0 Difficulty: Moderate EPSS 0.26% · P16
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I. Basic Information for CVE-2021-27241

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
This vulnerability allows local attackers to delete arbitrary directories on affected installations of Avast Premium Security 20.8.2429 (Build 20.8.5653.561). An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the AvastSvc.exe module. By creating a directory junction, an attacker can abuse the service to delete a directory. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. Was ZDI-CAN-12082.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5
Vulnerability Title
Avast Premium Security 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Avast Premium Security是捷克Avast公司的一个应用软件。用于全面扫描网站漏洞。 Avast Premium Security 20.8.2429 存在安全漏洞，攻击者可利用该漏洞可以滥用该服务来删除目录。
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
Avast Premium Security 20.8.2429 (Build 20.8.5653.561) -

II. Public POCs for CVE-2021-27241

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

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III. Intelligence Information for CVE-2021-27241

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Vendor Advisories for CVE-2021-27241 (1)

IV. Related Vulnerabilities

Same product: Premium Security
Same vendor: Avast
Same weakness: CWE-59

V. Comments for CVE-2021-27241

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