How severe is CVE-2019-18894?

CVE-2019-18894 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-18894 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-18894?

CVE-2019-18894 affects Avast Premium Security. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-18894?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2019-18894 published?

CVE-2019-18894 was published on 2020-01-13 and last updated on 2026-06-17.

CVE-2019-18894

CVE-2019-18894 is a high-severity vulnerability in Avast Premium Security with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 9.3
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Avast Premium Security
Published: 2020-01-13
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2019-18894?: 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.
How severe is CVE-2019-18894?: CVE-2019-18894 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-18894 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-18894?: CVE-2019-18894 affects Avast Premium Security. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-18894?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-18894 published?: CVE-2019-18894 was published on 2020-01-13 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:avast:premium_security:19.8.2393:*:*:*:*:*:*:*

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