CVE-2019-3581: McAfee Web Gateway denial of service attack due to Improper Input Validation

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-01-09 · updated 2026-06-17
Weakness: CWE-20

Description

Improper input validation in the proxy component of McAfee Web Gateway 7.8.2.0 and later allows remote attackers to cause a denial of service via a crafted HTTP request parameter.

Affected products

McAfee Web Gateway: from 7.8.2.0 before 7.8.2.5; from 8.0.0.0 before 8.0.2.0 — fixed in 7.8.2.5, 8.0.2.0

How to fix

Upgrade to a fixed version: McAfee Web Gateway 7.8.2.5, 8.0.2.0. Check the vendor advisory for mitigations.

References

https://kc.mcafee.com/corporate/index?page=content&id=SB10264
https://kc.mcafee.com/corporate/index?page=content&id=SB10264

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