What is CVE-2018-6334?

CVE-2018-6334 is a critical-severity vulnerability in Facebook Hhvm, classified under CWE-621. CVSS score: 9.8/10. Published 2018-12-31.

How severe is CVE-2018-6334?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Improper input validation in Facebook Hhvm

CVE-2018-6334

Multipart-file uploads call variables to be improperly registered in the global scope. In cases where variables are not declared explicitly before being used this can lead to unexpected behavior. This affects all supported versions of HHVM…

EPSS: 0.019 (77.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Facebook Hhvm — versions 3.25.2, 3.25.0, 3.24.6

Weakness classification (CWE)

References

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

Frequently asked questions

What is CVE-2018-6334?: CVE-2018-6334 is a critical-severity vulnerability in Facebook Hhvm, classified under CWE-621. CVSS score: 9.8/10. Published 2018-12-31.
How severe is CVE-2018-6334?: Critical severity. CVSS v3 base score is 9.8 out of 10.