How severe is CVE-2019-3639?

CVE-2019-3639 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2019-3639 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-3639?

CVE-2019-3639 affects Mcafee Web Gateway. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-3639?

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-2019-3639 published?

CVE-2019-3639 was published on 2019-08-14 and last updated on 2026-06-17.

CVE-2019-3639

CVE-2019-3639 is a high-severity vulnerability in Mcafee Web Gateway with a CVSS 3.x base score of 7.1. 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-1021.

Key facts

Severity: High (CVSS 3.x base score 7.1)
CVSS v2: 5.8
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1021
Affected product: Mcafee Web Gateway
Published: 2019-08-14
Last modified: 2026-06-17

Description

Clickjack vulnerability in Adminstrator web console in McAfee Web Gateway (MWG) 7.8.2.x prior to 7.8.2.12 allows remote attackers to conduct clickjacking attacks via a crafted web page that contains an iframe via does not send an X-Frame-Options HTTP header.

Frequently asked questions

What is CVE-2019-3639?: Clickjack vulnerability in Adminstrator web console in McAfee Web Gateway (MWG) 7.8.2.x prior to 7.8.2.12 allows remote attackers to conduct clickjacking attacks via a crafted web page that contains an iframe via does not send an X-Frame-Options HTTP header.
How severe is CVE-2019-3639?: CVE-2019-3639 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2019-3639 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-3639?: CVE-2019-3639 affects Mcafee Web Gateway. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-3639?: 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-2019-3639 published?: CVE-2019-3639 was published on 2019-08-14 and last updated on 2026-06-17.

References

https://kc.mcafee.com/corporate/index?page=content&id=SB10293

Affected products (1)

cpe:2.3:a:mcafee:web_gateway:*:*:*:*:*:*:*:*

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