Vulnerability · Published Oct 26, 2020 · Assigned by facebook

CVE-2020-1915

High 7.5

In plain English

A high-severity out-of-bounds read 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 1.6% (higher than 76% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)7.5High

Exploit odds (30 days)1.6%top 24.1% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

An out-of-bounds read in the JavaScript Interpreter in Facebook Hermes prior to commit 8cb935cd3b2321c46aa6b7ed8454d95c75a7fca0 allows attackers to cause a denial of service attack or possible further memory corruption 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	hermes-engine	0.7.2	GHSA-x4cf-6jr3-3qvp

Affected products (as reported)

Vendor	Product	Versions
Facebook	Hermes	commit prior to 8cb935cd3b2321c46aa6b7ed8454d95c75a7fca0

Weakness: CWE-125

References

https://www.facebook.com/security/advisories/cve-2020-1915 x_refsource_CONFIRM
https://github.com/facebook/hermes/commit/8cb935cd3b2321c46aa6b7ed8454d95c75a7fca0 x_refsource_CONFIRM