Out-of-bounds Read in Facebook Hhvm
CVE-2020-1918
In-memory file operations (ie: using fopen on a data URI) did not properly restrict negative seeking, allowing for the reading of memory prior to the in-memory buffer. This issue affects HHVM versions prior to 4.56.3, all versions between 4.57.0 and 4.80.1, all versions between 4.81.0 and 4.93.1, and versions 4.94.0, 4.95.0, 4.96.0, 4.97.0, 4.98.0.
EPSS: 0.012 (66.6th percentile) — read the EPSS interpretation.
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:H/I:N/A:N.
Affected products
- Facebook Hhvm — versions 4.98.1, 4.98.0, 4.97.1
Weakness classification (CWE)
References
- cve-assign@fb.com (x_refsource_MISC, Release Notes, Vendor Advisory)
- cve-assign@fb.com (Patch, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2020-1918?
- CVE-2020-1918 is a high-severity vulnerability in Facebook Hhvm, classified under Buffer Under-read. CVSS score: 7.5/10. Published 2021-03-10.
- How severe is CVE-2020-1918?
- High severity. CVSS v3 base score is 7.5 out of 10.