Vulnerability · Published Feb 2, 2021 · Assigned by facebook

CVE-2020-1896

Critical 9.8

In plain English

A critical-severity stack buffer overflow in Hermes from Facebook. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.5% (higher than 85% of all known vulnerabilities).

Severity (CVSS NVD)9.8Critical

Exploit odds (30 days)2.5%top 15.1% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
Facebook	Hermes	commit prior to 86543ac47e59c522976b5632b8bf9a2a4583c7d2

Weakness: CWE-121

References

https://www.facebook.com/security/advisories/cve-2020-1896 x_refsource_CONFIRM
https://github.com/facebook/hermes/commit/86543ac47e59c522976b5632b8bf9a2a4583c7d2 x_refsource_CONFIRM