Out-of-bounds Read in Facebook Hhvm

CVE-2019-11935

Insufficient boundary checks when processing a string in mb_ereg_replace allows access to out-of-bounds memory. This issue affects HHVM versions prior to 3.30.12, all versions between 4.0.0 and 4.8.5, all versions between 4.9.0 and 4.23.1…

Vulnerability class: Buffer Overflow

EPSS: 0.015 (71.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2019-11935?
CVE-2019-11935 is a critical-severity vulnerability in Facebook Hhvm, classified under Out-of-bounds Read. CVSS score: 9.8/10. Published 2019-12-04.
How severe is CVE-2019-11935?
Critical severity. CVSS v3 base score is 9.8 out of 10.