What’s Vulnerable › Vulnerabilities

CVE-2021-24044

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-01-15 · updated 2026-06-17
• Weakness: CWE-843

Description

By passing invalid javascript code where await and yield were called upon non-async and non-generator getter/setter functions, Hermes would invoke generator functions and error out on invalid await/yield positions. This could result in segmentation fault as a consequence of type confusion error, with a low chance of RCE. This issue affects Hermes versions prior to v0.10.0.

Affected products

• Facebook Hermes: before 0.10.0 — fixed in 0.10.0

How to fix

Upgrade to a fixed version: Facebook Hermes 0.10.0. Check the vendor advisory for mitigations.

References

• https://www.facebook.com/security/advisories/cve-2021-24044
• https://www.facebook.com/security/advisories/cve-2021-24044

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