What is CVE-2020-1896?

CVE-2020-1896 is a critical-severity vulnerability in Facebook Hermes, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2021-02-02.

How severe is CVE-2020-1896?

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

Buffer overflow in Facebook Hermes

CVE-2020-1896

A stack overflow vulnerability in Facebook Hermes 'builtin apply' prior to commit 86543ac47e59c522976b5632b8bf9a2a4583c7d2 (https://github.com/facebook/hermes/commit/86543ac47e59c522976b5632b8bf9a2a4583c7d2) allows attackers to potentially execute arbitrary code via crafted JavaScript. Note that this is only exploitable if the application using Hermes permits evaluation of untrusted JavaScript. Hence, most React Native applications are not affected.

Vulnerability class: Buffer Overflow

EPSS: 0.024 (83.1th 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 Hermes — versions commit prior to 86543ac47e59c522976b5632b8bf9a2a4583c7d2

Weakness classification (CWE)

References

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

Frequently asked questions

What is CVE-2020-1896?: CVE-2020-1896 is a critical-severity vulnerability in Facebook Hermes, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2021-02-02.
How severe is CVE-2020-1896?: Critical severity. CVSS v3 base score is 9.8 out of 10.