CVE-2021-24044 json
Access of Resource Using Incompatible Type in Hermes
published 2022-01-15 4 y ago modified 2026-06-17 4 mo ago also GHSA-7mhc-prgv-r3q4 , EUVD-2022-0501
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.3%
- EPSS 1.3% chance of exploitation in 30 days, percentile 70%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- npm hermes-engine 0.10.0
- Facebook Hermes 0.10.0
Exploit prediction
1.30% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
| GitHub | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | hermes-engine | <0.10.0 |
0.10.0 |
Affected products
- Facebook Hermes
Classification
- Weakness
-
- CWE-843 Access of Resource Using Incompatible Type
References
-
facebook.com
/security/advisories/cve-2021-24044
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-24044
advisory
-
github.com
/facebook/hermes
package
Sources
- CVE List CVE-2021-24044
- GitHub Advisory GHSA-7mhc-prgv-r3q4
- NVD CVE-2021-24044
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