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CVE-2021-27241

This vulnerability allows local attackers to delete arbitrary directories on affected...

6.1 Medium

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.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
Low
Availability
High

Exploit likelihood

0.27%Unchanged since Apr 14, 2021
90%50%10%1%

What each source reports

CVE List Score used 6.1

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.

Record
CVE-2021-27241
CVSS 3.0
6.1 MediumCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Weakness
CWE-59
Updated
2026-11-02
EUVDEUVD-2021-14006 6.1

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.

Record
EUVD-2021-14006
CVSS 3.0
6.1 MediumCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Updated
2026-11-03
GitHub AdvisoriesGHSA-76qj-3c6g-8v48 No score

This vulnerability allows local attackers to delete arbitrary directories on affected...

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.

Record
GHSA-76qj-3c6g-8v48
Weakness
CWE-59
Updated
2026-11-02
NVD 6.1

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.

Record
CVE-2021-27241
CVSS 3.1
6.1 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
CVSS 3.0
6.1 MediumCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
CVSS 2.0
3.6 LowAV:L/AC:L/Au:N/C:N/I:P/A:P
Weakness
CWE-59
Updated
2026-11-02

Affected products

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-27241 is a medium vulnerability (CVSS 6.1) in Avast Premium Security, published March 29, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.27%, the 19th percentile. No source names a fixed version.

References

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