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.

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

EPSS: 0.014 (70.3th percentile) — read the EPSS interpretation.

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.

Affected products

Facebook Hhvm — versions unspecified, 3.30.1, 3.30

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

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

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.