Out-of-bounds Read in Facebook Hhvm
CVE-2020-1893
Insufficient boundary checks when decoding JSON in TryParse reads out of bounds memory, potentially leading to DOS. This issue affects HHVM 4.45.0, 4.44.0, 4.43.0, 4.42.0, 4.41.0, 4.40.0, 4.39.0, versions between 4.33.0 and 4.38.0 (inclusive), versions between 4.9.0 and 4.32.0 (inclusive), and versions prior to 4.8.7.
Vulnerability class: Buffer Overflow
EPSS: 0.011 (63.5th 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:N/I:N/A:H.
Affected products
- Facebook Hhvm — versions 4.45.1, 4.45.0, 4.44.1
Weakness classification (CWE)
References
- cve-assign@fb.com (x_refsource_CONFIRM, Vendor Advisory)
- cve-assign@fb.com (x_refsource_CONFIRM, Patch)
Frequently asked questions
- What is CVE-2020-1893?
- CVE-2020-1893 is a high-severity vulnerability in Facebook Hhvm, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2020-03-03.
- How severe is CVE-2020-1893?
- High severity. CVSS v3 base score is 7.5 out of 10.