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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.015 (72.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 72.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000
Affected products
- Facebook Hhvm — versions unspecified, 3.24.6, 3.25.2
Weakness classification (CWE)
References
- hhvm.com/blog/2018/05/04/hhvm-3.25.3.html (Vendor Advisory)
- github.com/facebook/hhvm/commit/4cb57dd753a339654ca464c139db9871fe961d56 (Patch, Third Party Advisory)
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.