Is CVE-2018-6332 actively exploited?

No active exploitation of CVE-2018-6332 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2018-6332 be exploited remotely?

Yes. CVE-2018-6332 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2018-6332?

CVE-2018-6332 has a CVSS score of 5.9 (MEDIUM).

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MEDIUM

CVE-2018-6332

CWE-400Published: December 3, 2018· Updated: Jun 17, 2026

5.9

CVSS v3.1

Official Description

A potential denial-of-service issue in the Proxygen handling of invalid HTTP2 settings which can cause the server to spend disproportionate resources. This affects all supported versions of HHVM (3.24.3 and 3.21.7 and below) when using the proxygen server to handle HTTP2 requests.

NVD Source

Technical Analysis

CVE-2018-6332 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.9.