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 prior to the patch (3.25.1, 3.24.5, and 3.21.9 and below).
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.019 (79.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000
Affected products
- Facebook Hhvm — versions 3.25.2, 3.25.0, 3.24.6
Weakness classification (CWE)
References
- github.com/facebook/hhvm/commit/6937de5544c3eead3466b75020d8382080ed0cff (Patch, Third Party Advisory)
- hhvm.com/blog/2018/03/30/hhvm-3.25.2.html (Patch, Third Party Advisory)
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.