Out-of-bounds Read in Facebook Hhvm
CVE-2020-1919
Incorrect bounds calculations in substr_compare could lead to an out-of-bounds read when the second string argument passed in is longer than the first. 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.
Vulnerability class: Buffer Overflow
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:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.012 (67.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000
Affected products
- Facebook Hhvm — versions 4.98.1, 4.98.0, 4.97.1
Weakness classification (CWE)
References
- hhvm.com/blog/2021/02/25/security-update.html (Release Notes, Vendor Advisory)
- github.com/facebook/hhvm/commit/08193b7f0cd3910256e00d599f0f3eb2519c44ca (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-1919?
- CVE-2020-1919 is a high-severity vulnerability in Facebook Hhvm, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2021-03-10.
- How severe is CVE-2020-1919?
- High severity. CVSS v3 base score is 7.5 out of 10.