CVE-2021-24037
CRITICALHermes < 0.8.0 - Use-After-Free via Error Message Emission
Title source: llmDescription
A use after free in hermes, while emitting certain error messages, prior to commit d86e185e485b6330216dee8e854455c694e3a36e 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.
References (2)
Core 2
Core References
Patch, Third Party Advisory x_refsource_confirm
https://github.com/facebook/hermes/commit/d86e185e485b6330216dee8e854455c694e3a36e
Vendor Advisory x_refsource_confirm
https://www.facebook.com/security/advisories/CVE-2021-24037
Scores
CVSS v3
9.8
EPSS
0.0180
EPSS Percentile
75.6%
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-416
Status
published
Products (2)
facebook/hermes
< 0.8.0
npm/hermes-engine
0 - 0.8.0npm
Published
Jun 15, 2021
Tracked Since
Feb 18, 2026