CVE-2019-18894

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-01-13 · updated 2026-06-17
Weakness: CWE-78

Description

In Avast Premium Security 19.8.2393, attackers can send a specially crafted request to the local web server run by Avast Antivirus on port 27275 to support Bank Mode functionality. A flaw in the processing of a command allows execution of arbitrary OS commands with the privileges of the currently logged in user. This allows for example attackers who compromised a browser extension to escape from the browser sandbox.

Affected products

Avast Premium Security: 19.8.2393

References

https://palant.de/2020/01/13/pwning-avast-secure-browser-for-fun-and-profit/
https://palant.de/2020/01/13/pwning-avast-secure-browser-for-fun-and-profit/

Get alerted when CVE-2019-18894 or the next vulnerability affects your stack