What’s Vulnerable › Vulnerabilities

CVE-2021-27241

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-03-29 · updated 2026-06-17
• Weakness: CWE-59

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.

Affected products

• Avast Premium Security: 20.8.2429

References

• https://www.zerodayinitiative.com/advisories/ZDI-21-208/
• https://www.zerodayinitiative.com/advisories/ZDI-21-208/

Get alerted when CVE-2021-27241 or the next vulnerability affects your stack