What is CVE-2020-1900?

CVE-2020-1900 is a critical-severity vulnerability in Facebook Hhvm, classified under Use After Free. CVSS score: 9.8/10. Published 2021-03-11.

How severe is CVE-2020-1900?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Use After Free in Facebook Hhvm

CVE-2020-1900

When unserializing an object with dynamic properties HHVM needs to pre-reserve the full size of the dynamic property array before inserting anything into it. Otherwise the array might resize, invalidating previously stored references. This…

Vulnerability class: Use-After-Free

EPSS: 0.014 (69.2th 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 4.58.2, 4.60.1, unspecified

Weakness classification (CWE)

CWE-416 — Use After Free

References

cve-assign@fb.com (x_refsource_CONFIRM, Vendor Advisory)
cve-assign@fb.com (Patch, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2020-1900?: CVE-2020-1900 is a critical-severity vulnerability in Facebook Hhvm, classified under Use After Free. CVSS score: 9.8/10. Published 2021-03-11.
How severe is CVE-2020-1900?: Critical severity. CVSS v3 base score is 9.8 out of 10.