VULNERABILITY INTELLIGENCE

CVE-2021-24025

CVSS score9.8 CRITICAL

EPSS probability1.66%

CISA KEVNot currently listed

Published2021-03-10

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

Due to incorrect string size calculations inside the preg_quote function, a large input string passed to the function can trigger an integer overflow leading to a heap overflow. 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.

Weakness classification

cve-assign@fb.com: CWE-122
nvd@nist.gov: CWE-190

Primary references

cve-assign@fb.com — Patch, Third Party Advisory
cve-assign@fb.com — Release Notes, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Release Notes, Third Party Advisory