Type Confusion Vulnerability in Facebook Hermes JavaScript Engine
CVE-2021-24045

9.8CRITICAL

Key Information:

Vendor

Facebook

Status
Hermes
Vendor
CVE Published:
13 December 2021

What is CVE-2021-24045?

A type confusion vulnerability exists in the Facebook Hermes JavaScript engine that can be triggered by resolving the 'typeof' unary operator. This vulnerability is particularly concerning when an application utilizing Hermes allows for the evaluation of untrusted JavaScript. However, it is important to note that most React Native applications are not vulnerable as they do not typically permit such evaluations. The issue is fixed in Hermes version 0.10.0, mitigating the risks associated with this vulnerability.

Affected Version(s)

Hermes < 0.10.0

Hermes 0.10.0

References

https://www.facebook.com/security/advisories/cve-2021-24045
x_refsource_CONFIRM
https://github.com/facebook/hermes/commit/55e1b2343f4deb1...
x_refsource_MISC

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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CVE-2021-24045 : Type Confusion Vulnerability in Facebook Hermes JavaScript Engine