CVE-2019-11230

Severity: medium (CVSS 4.4 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2019-07-18 · updated 2026-06-17
Weakness: CWE-59

Description

In Avast Antivirus before 19.4, a local administrator can trick the product into renaming arbitrary files by replacing the Logs\Update.log file with a symlink. The next time the product attempts to write to the log file, the target of the symlink is renamed. This defect can be exploited to rename a critical product file (e.g., AvastSvc.exe), causing the product to fail to start on the next system restart.

Affected products

Avast Antivirus: before 19.4 — fixed in 19.4

How to fix

Upgrade to a fixed version: Avast Antivirus 19.4. Check the vendor advisory for mitigations.

References

http://www.mcerlane.co.uk/CVE-2019-11230/
http://www.securityfocus.com/bid/109344
http://www.mcerlane.co.uk/CVE-2019-11230/
http://www.securityfocus.com/bid/109344

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