CVE-2020-1914

Published: Oct 8, 2020Modified: Jun 17, 2026

9.8

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitability: 3.9 / Impact: 5.9

Source: NVD

Description

A logic vulnerability when handling the SaveGeneratorLong instruction in Facebook Hermes prior to commit b2021df620824627f5a8c96615edbd1eb7fdddfc allows attackers to potentially read out of bounds or theoretically 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 (1)

Products: Facebook: Hermes

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Facebook Hermes	Before 2020-10-01

Related CWEs

Always-Incorrect Control Flow Implementation

The code contains a control flow path that does not reflect the algorithm that the path is intended to implement, leading to incorrect behavior any time this path is navigated.

References (4)

https://github.com/facebook/hermes/commit/b2021df620824627f5a8c96615edbd1eb7fdddfc

Source: cve-assign@fb.com

PatchThird Party Advisory

https://www.facebook.com/security/advisories/cve-2020-1914

Source: cve-assign@fb.com

Vendor Advisory

https://github.com/facebook/hermes/commit/b2021df620824627f5a8c96615edbd1eb7fdddfc

Source: af854a3a-2127-422b-91ae-364da2661108

PatchThird Party Advisory

https://www.facebook.com/security/advisories/cve-2020-1914

Source: af854a3a-2127-422b-91ae-364da2661108

Vendor Advisory

Timeline

No history available yet.