VULNERABILITY INTELLIGENCE

CVE-2020-1898

CVSS score7.5 HIGH

EPSS probability1.21%

CISA KEVNot currently listed

Published2021-03-11

Last modified2026-06-17

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

Description

The fb_unserialize function did not impose a depth limit for nested deserialization. That meant a maliciously constructed string could cause deserialization to recurse, leading to stack exhaustion. This issue affected HHVM prior to v4.32.3, between versions 4.33.0 and 4.56.0, 4.57.0, 4.58.0, 4.58.1, 4.59.0, 4.60.0, 4.61.0, 4.62.0.

Weakness classification

cve-assign@fb.com: CWE-674
nvd@nist.gov: CWE-674

Primary references

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