Buffer overflow in Facebook Hhvm
CVE-2021-24025
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 version…
Vulnerability class: Buffer Overflow
EPSS: 0.017 (74.1th 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
- Facebook Hhvm — versions 4.98.1, 4.98.0, 4.97.1
Weakness classification (CWE)
References
- cve-assign@fb.com (Third Party Advisory, x_refsource_MISC, Release Notes)
- cve-assign@fb.com (Patch, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-24025?
- CVE-2021-24025 is a critical-severity vulnerability in Facebook Hhvm, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2021-03-10.
- How severe is CVE-2021-24025?
- Critical severity. CVSS v3 base score is 9.8 out of 10.