CVE-2020-1914
CRITICALFacebook Hermes < 2020-10-01 - Always-Incorrect Control Flow Implementation in SaveGeneratorLong Instruction
Title source: llmDescription
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.
References (2)
Core 2
Core References
Vendor Advisory x_refsource_confirm
https://www.facebook.com/security/advisories/cve-2020-1914
Patch, Third Party Advisory x_refsource_confirm
https://github.com/facebook/hermes/commit/b2021df620824627f5a8c96615edbd1eb7fdddfc
Scores
CVSS v3
9.8
EPSS
0.0241
EPSS Percentile
81.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Details
CWE
CWE-670
Status
published
Products (2)
facebook/hermes
< 2020-10-01
npm/hermes-engine
0 - 0.7.2npm
Published
Oct 08, 2020
Tracked Since
Feb 18, 2026