CVE-2021-24037

Published: Jun 15, 2021Modified: 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 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.

Affected (1)

Products: Facebook: Hermes

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Facebook Hermes	Before 0.8.0

Related CWEs

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

References (4)

https://github.com/facebook/hermes/commit/d86e185e485b6330216dee8e854455c694e3a36e

Source: cve-assign@fb.com

PatchThird Party Advisory

https://www.facebook.com/security/advisories/CVE-2021-24037

Source: cve-assign@fb.com

Vendor Advisory

https://github.com/facebook/hermes/commit/d86e185e485b6330216dee8e854455c694e3a36e

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

PatchThird Party Advisory

https://www.facebook.com/security/advisories/CVE-2021-24037

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

Vendor Advisory

Timeline

No history available yet.