Vulnerability · Published Sep 9, 2020 · Assigned by facebook

CVE-2020-1913

High 8.1

In plain English

A high-severity security flaw 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 1.2% (higher than 68% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)8.1High

Exploit odds (30 days)1.2%top 31.6% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

An Integer signedness error in the JavaScript Interpreter in Facebook Hermes prior to commit 2c7af7ec481ceffd0d14ce2d7c045e475fd71dc6 allows attackers to cause a denial of service attack or a potential RCE 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	0.5.2	GHSA-gmpm-xp43-f7g6

Affected products (as reported)

Vendor	Product	Versions
Facebook	Hermes	commit prior to 2c7af7ec481ceffd0d14ce2d7c045e475fd71dc6

Weakness: CWE-195

References

https://www.facebook.com/security/advisories/cve-2020-1913 x_refsource_CONFIRM
https://github.com/facebook/hermes/commit/2c7af7ec481ceffd0d14ce2d7c045e475fd71dc6 x_refsource_CONFIRM