Out-of-bounds Read in Facebook Hhvm
CVE-2018-6340
The Memcache::getextendedstats function can be used to trigger an out-of-bounds read. Exploiting this issue requires control over memcached server hostnames and/or ports. This affects all supported versions of HHVM (3.30 and 3.27.4 and below).
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.014 (72.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 72.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000
Affected products
- Facebook Hhvm — versions unspecified, 3.30.1, 3.30
Weakness classification (CWE)
References
- hhvm.com/blog/2018/12/18/hhvm-3.30.1.html (Third Party Advisory)
- github.com/facebook/hhvm/commit/4bff3bfbe90d10451e4638c2118d1ad1117bb3e3 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2018-6340?
- CVE-2018-6340 is a high-severity vulnerability in Facebook Hhvm, classified under Out-of-bounds Read. CVSS score: 8.1/10. Published 2018-12-31.
- How severe is CVE-2018-6340?
- High severity. CVSS v3 base score is 8.1 out of 10.