How severe is CVE-2019-18653?

CVE-2019-18653 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2019-18653 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-18653?

CVE-2019-18653 primarily affects Avast Antivirus. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-18653?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2019-18653 published?

CVE-2019-18653 was published on 2019-11-01 and last updated on 2026-06-17.

CVE-2019-18653

CVE-2019-18653 is a medium-severity vulnerability in Avast Antivirus with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Avast Antivirus
Published: 2019-11-01
Last modified: 2026-06-17

Description

A Cross Site Scripting (XSS) issue exists in Avast AntiVirus (Free, Internet Security, and Premiere Edition) 19.3.2369 build 19.3.4241.440 in the Network Notification Popup, allowing an attacker to execute JavaScript code via an SSID Name.

Frequently asked questions

What is CVE-2019-18653?: A Cross Site Scripting (XSS) issue exists in Avast AntiVirus (Free, Internet Security, and Premiere Edition) 19.3.2369 build 19.3.4241.440 in the Network Notification Popup, allowing an attacker to execute JavaScript code via an SSID Name.
How severe is CVE-2019-18653?: CVE-2019-18653 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2019-18653 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-18653?: CVE-2019-18653 primarily affects Avast Antivirus. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-18653?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-18653 published?: CVE-2019-18653 was published on 2019-11-01 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:avast:antivirus:19.3.2369:*:*:*:free:*:*:*
cpe:2.3:a:avast:antivirus:19.3.2369:*:*:*:internet_security:*:*:*
cpe:2.3:a:avast:antivirus:19.3.2369:*:*:*:premiere:*:*:*

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