What is CVE-2018-6335?

CVE-2018-6335 is a high-severity vulnerability in Facebook Hhvm, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2018-12-31.

How severe is CVE-2018-6335?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Facebook Hhvm

CVE-2018-6335

A Malformed h2 frame can cause 'std::out_of_range' exception when parsing priority meta data. This behavior can lead to denial-of-service. This affects all supported versions of HHVM (3.25.2, 3.24.6, and 3.21.10 and below) when using the proxygen server to handle HTTP2 requests.

Vulnerability class: DoS (Denial of Service)

EPSS: 0.015 (71.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Facebook Hhvm — versions unspecified, 3.24.6, 3.25.2

Weakness classification (CWE)

References

cve-assign@fb.com (x_refsource_MISC, Vendor Advisory)
cve-assign@fb.com (Patch, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2018-6335?: CVE-2018-6335 is a high-severity vulnerability in Facebook Hhvm, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2018-12-31.
How severe is CVE-2018-6335?: High severity. CVSS v3 base score is 7.5 out of 10.